
Le 31
Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim
This is a men's single-breasted suit jacket in Le 31 by Simons' London fit, a semi-slim cut that narrows at the waist and is finished with regular sleeves, notch lapels, a two-button front closure, a left chest welt pocket, two flap hip pockets and side vents. It is made from a stretch European suiting fabric blending responsible wool with polyester produced from recycled plastic bottles, and is fully lined with a satiny lining; structured shoulders and tonal cuff buttons complete the construction. It is intended as a suit separate for business and formal wear, and the matching trousers are sold separately under style number 12016-230863.
- Material
- blend of responsible wool and polyester made from recycled plastic bottles
- Gender
- male
- Style
- formal, business, tailored, slim-fit, classic
- Category
- Apparel & Accessories > Clothing > Suits
Specifications
Semi-slim London-fit suit jacket in a stretch responsible wool blend with peaked lapels and full satin lining.
Peaked lapel, piped flap pockets, side vents, full satiny lining, stretch European wool-recycled polyester fabric, and a waist-narrowing London fit.
- Material
- blend of responsible wool and polyester made from recycled plastic bottles
- Secondary
- recycled-polyester
- Style
- formal, business, tailored, slim-fit, classic
- Occasion
- work, business-casual, formal, interview, wedding
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Suits
Additional Attributes
- London fit narrows at the waist
- semi-slim silhouette
- regular sleeves
- peaked lapel collar
- piped flap pockets
- side vents
- stretch fabric
- luxurious European fabric
- responsible wool and recycled polyester blend
- polyester made from recycled plastic bottles
- full satiny lining
- exclusive Le 31 by Simons design
- designed in Canada
- matching pant sold separately
Product Insights
Shell is 55% responsible wool, 41% recycled-bottle polyester and 4% elastane; lining is 100% recycled-bottle polyester London fit is a semi-slim cut that narrows at the waist with regular sleeves 4% elastane gives the cloth stretch through the chest and sleeves Dry clean only; professional cleaning is required Charcoal starts at 38-REG, while Chocolate/Espresso and Blue each include 36-REG Wool/polyester blend is positioned as an affordable, season-after-season favourite
Verified claims
- materials
- Shell is 55% responsible wool, 41% recycled-bottle polyester and 4% elastane; lining is 100% recycled-bottle polyester
- fabric_behavior
- 4% elastane gives the cloth stretch through the chest and sleeves
- fabric_behavior
- Wool/polyester blend creates a comfortable fabric with a supple drape
- lining
- Full satin lining reduces friction and makes the jacket easier to put on and take off
- sizing
- Order your usual chest size; size up only if between sizes or wanting extra waist room
- sizing
- REG is intended for 5'10" and up; LONG for 6'2" and taller, available in 42, 44 and 46
- color_availability
- Charcoal starts at 38-REG, while Chocolate/Espresso and Blue each include 36-REG
- care
- Between cleanings, air and brush the fabric; light steam is fine but skip water-based spot treatments
- care
- Don't wear the jacket two days in a row; let the fibres rest
- care
- Store on a shaped hanger and use a garment bag when travelling
- construction
- Single-breasted two-button front with flap hip pockets, welt chest pocket and side vents
- construction
- PDP copy says peaked lapel, while product images show notch lapels
- construction
- Rear shows a center back seam, a single center vent and three tonal buttons at each cuff
- appearance
- Fine, smooth woven suiting with a subtle heathered texture and matte finish
- styling
- Styled with matching trousers, a white striped shirt and dark loafers
- use_cases
- Suited to business, formal events and season-spanning tailored wear
- value
- Wool/polyester blend is positioned as an affordable, season-after-season favourite
Product record
- Title
- Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim
- Brand
- Le 31
- Price
- 350 CAD
- Availability
- In stock
Buying Guide
1 comparison · 10 sourcesUses
Dressing up for the office or formal occasions with a structured semi-slim jacket
A dark charcoal single-breasted suit jacket with notch lapels and a fit that narrows at the waist, worn as a suit separates piece for office wear or formal occasions where a tailored, put-together look is wanted. Its semi-slim silhouette and two-button closure keep the profile neat, and it can be paired with matching suit trousers.[1,2]
Product comparison
Compared within this brand.
| Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim: Choose this if you want a semi-slim, single-breasted suit jacket with a waist-narrowing London fit from Le 31, an exclusive Simons brand designed in Canada. Its stretch weave of 55% responsible wool, 41% recycled-bottle polyester, and 4% elastane with a full satiny lining suits dressers who want classic suiting with a bit of give, and it comes in Charcoal, Chocolate/Espresso, and Blue in regular sizes 36 to 48 and long sizes 42 to 46.[1,2] | Stretch Wool Suit Jacket London Fit - Semi-Slim: Choose this if you want a semi-slim London fit that narrows at the waist with a 7 inch drop, in a stretch fabric Le 31 describes as draping softly for a comfortable, elegant wear. It is a single-breasted, two-button jacket with notch lapels, flap and welt chest pockets, side vents, and a thin recycled-polyester lining, made of 55% responsible wool, 41% recycled-polyester and 4% elastane, with matching pants available. It comes in Light Grey and Pine/Bottle Green in regular sizes 36 through 46, but note the Pine/Bottle Green color does not appear in a 46-LONG option while Light Grey does.[3,4,5,6] | Essential Wool-Blend Suit Jacket London Fit - Semi-Slim: Choose this if you want a semi-slim London-fit wool-blend suit jacket in a classic dark navy with a smooth, matte finish — it offers a two-button single-breasted front, notch lapels, structured shoulders, and a straight hem that falls below the waist. It's a solid pick for building a suit from separates, with flap hip pockets, a welt chest pocket, buttoned cuffs, and a lining made entirely from recycled plastic bottles. Note that the exact wool/blend ratio isn't specified, and the color and size list (36 to 48, including short and long options) reflects saved catalog data, so current availability may differ.[7,8,9,10] |
Image Analysis
3 images- 01

Product
Front-on view of a dark charcoal single-breasted suit jacket on a model, showing lapels, pocket details, and two-button closure; fabric appears smooth and matte with vertical front seams and structured shoulders.
- SilhouetteSingle-breasted jacket shown from the front with a fitted, semi-slim silhouette ending around the upper thigh on the model
1 region
x 0.12 · y 0.10 · w 0.76 · h 0.78 (high) - LapelsNotch lapels with a moderate width and a visible seam where lapel meets collar
1 region
x 0.30 · y 0.12 · w 0.40 · h 0.20 (high) - ClosureTwo visible front buttons for closure; top button sits near mid-torso and lower button slightly below
1 region
x 0.43 · y 0.44 · w 0.14 · h 0.15 (high) - Chest pocketLeft chest welt pocket with a narrow welt opening, no pocket square present
1 region
x 0.62 · y 0.29 · w 0.18 · h 0.07 (high) - Hip pocketsTwo front hip pockets with horizontal flaps; flaps sit flush against the jacket body
2 regions
x 0.18 · y 0.54 · w 0.24 · h 0.12 (high); x 0.58 · y 0.56 · w 0.24 · h 0.12 (high) - Front seamsVertical front seams/darts run from the chest toward the hem forming a slightly contoured front panel
2 regions
x 0.36 · y 0.28 · w 0.12 · h 0.50 (high); x 0.52 · y 0.28 · w 0.12 · h 0.50 (high) - Shoulder constructionStructured shoulders with a smooth outer line and slight padding visible at the shoulder edge
2 regions
x 0.25 · y 0.12 · w 0.22 · h 0.18 (high); x 0.54 · y 0.12 · w 0.26 · h 0.20 (high) - Sleeve length and cuffSleeves end at wrist with the model's shirt cuff extending beyond the jacket sleeve on the left arm
2 regions
x 0.60 · y 0.64 · w 0.30 · h 0.22 (high); x 0.14 · y 0.68 · w 0.20 · h 0.22 (high) - Fabric appearanceFine woven suiting fabric with a smooth, matte finish and subtle weave texture visible at close inspection
1 region
x 0.28 · y 0.22 · w 0.44 · h 0.58 (medium)
Other
Studio product shot on a plain light background showing a model wearing the jacket; visible accessories and composition details noted.
- Background and lightingEven, soft studio lighting on a uniform light gray background with minimal shadows
- Model poseModel facing forward with head slightly turned to the left and right hand adjusting the jacket near the middle button
1 region
x 0.40 · y 0.30 · w 0.36 · h 0.48 (high) - Visible accessoriesMetal wristwatch on the model's left wrist and a black belt with a silver rectangular buckle are visible but are not part of the jacket
2 regions
x 0.68 · y 0.66 · w 0.18 · h 0.16 (high); x 0.42 · y 0.73 · w 0.22 · h 0.13 (high)
Colors
charcoal gray· jacket fabric- SilhouetteSingle-breasted jacket shown from the front with a fitted, semi-slim silhouette ending around the upper thigh on the model
- 02

Product
Men's suit shown on a model in a three-quarter side pose; visible components include a charcoal-gray single-breasted jacket with notch lapel, matching trousers, a white button-up shirt with thin vertical stripes, and dark leather loafers.
- Jacket shape and viewSingle-breasted jacket shown from a three-quarter side (left-facing) view with natural shoulder, slightly tapered waist, and a medium-length hem finishing near the upper thigh.
1 region
x 0.36 · y 0.10 · w 0.34 · h 0.45 (high) - LapelsNotch lapels with a moderate width and a visible lapel roll.
1 region
x 0.40 · y 0.12 · w 0.18 · h 0.12 (high) - ClosureTwo-button front closure visible with buttons fastened on the lower half of the jacket front; upper button area partly covered by lapel.
1 region
x 0.42 · y 0.28 · w 0.14 · h 0.18 (high) - Chest pocketLeft chest welt pocket visible without a pocket square.
1 region
x 0.45 · y 0.18 · w 0.10 · h 0.06 (high) - Hip pocketsFlap hip pockets on the jacket front; right-side flap pocket partially covered by model's hand in pocket.
1 region
x 0.44 · y 0.36 · w 0.16 · h 0.10 (high) - Sleeve detailsJacket sleeves end at wrist showing a small portion of shirt cuff; row of sleeve buttons visible at the cuff area.
1 region
x 0.56 · y 0.38 · w 0.10 · h 0.12 (high) - Rear ventBack vent area is partially visible at the jacket hem on the model's right side; appears as a single center/back vent but not fully revealed.Partial
1 region
x 0.60 · y 0.40 · w 0.12 · h 0.18 (medium) - Trousers constructionMatching trousers with a straight leg and a pressed center crease visible on the front leg.
1 region
x 0.43 · y 0.48 · w 0.26 · h 0.42 (high) - ShirtWhite button-up dress shirt with thin vertical gray stripes and a classic pointed collar, collar visible above the jacket lapel.
1 region
x 0.42 · y 0.14 · w 0.14 · h 0.12 (high) - FootwearDark glossy leather loafers with a low heel and visible stitching on the upper, worn with light-colored socks.
1 region
x 0.34 · y 0.84 · w 0.36 · h 0.12 (high) - WatchWristwatch visible on the model's left wrist partly exposed under the jacket sleeve.
1 region
x 0.56 · y 0.46 · w 0.06 · h 0.06 (medium)
Other
Studio product shot with a standing model against a seamless white background; soft, even lighting with minimal shadows and the image cropped to show full body from head to shoes.
- Background and lightingPlain seamless white background with soft, even studio lighting producing minimal shadowing under the model.
- Pose and compositionModel stands in a relaxed three-quarter side pose facing slightly to viewer's right with left hand in trouser pocket and right arm relaxed at side.
1 region
x 0.24 · y 0.05 · w 0.52 · h 0.90 (high) - Image qualityHigh-resolution image with clear detail and neutral color rendering.
Colors
charcoal gray· jacketcharcoal gray· trouserswhite with light gray stripes· shirtdark brown· shoes- Jacket shape and viewSingle-breasted jacket shown from a three-quarter side (left-facing) view with natural shoulder, slightly tapered waist, and a medium-length hem finishing near the upper thigh.
- 03

Product
Rear view of a single-breasted dark charcoal suit jacket showing the back panel, shoulder seams, sleeves, collar roll, center back seam and cuff button details.
- Back panelFull back panel with a visible vertical center seam running from the collar to the hem.
1 region
x 0.14 · y 0.12 · w 0.72 · h 0.68 (high) - Center vent / hem splitSlight separation at the hem along the center seam suggesting a single center vent; the vent area is partially visible.Partial
1 region
x 0.40 · y 0.70 · w 0.20 · h 0.18 (medium) - Shoulder constructionShoulders are structured with a smooth seam from shoulder to sleeve giving a slightly squared shoulder line.
1 region
x 0.14 · y 0.12 · w 0.72 · h 0.18 (high) - Sleeve and cuff detailLong sleeves finishing in a narrow cuff with a visible row of three dark buttons on each cuff; buttons are tonal and vertically aligned near the cuff edge.
2 regions
x 0.10 · y 0.66 · w 0.18 · h 0.24 (high); x 0.72 · y 0.66 · w 0.18 · h 0.24 (high) - Collar and necklineRear of a notched jacket collar with a collar roll and visible collar seam sitting above the center back seam; a white shirt collar is visible underneath.
1 region
x 0.36 · y 0.06 · w 0.28 · h 0.12 (high) - Fabric appearanceFine, smooth woven suiting fabric with a subtle heathered texture in the dark gray tonality; surface appears matte with minimal sheen.
1 region
x 0.20 · y 0.20 · w 0.60 · h 0.58 (high)
Other
Studio rear-shot on a plain light neutral background showing the model from head to mid-thigh. Even, diffuse lighting with soft shadows and slight left-side rim shadow. Image is well centered and cropped to include the jacket back and part of matching trousers and hands.
- Model and poseMale model photographed from behind with head turned slightly to the left; hands relaxed and visible at lower frame edges.
1 region
x 0.06 · y 0.00 · w 0.88 · h 1.00 (high) - Background and lightingUniform light gray to off-white background with even diffuse studio lighting and soft minimal shadows under the hem and arms.
- Framing and cropImage framed to show full back of jacket down to the top of the trousers; top of the head and hands are included within the frame.
Colors
dark charcoal gray· jacket body- Back panelFull back panel with a visible vertical center seam running from the collar to the hem.
Variants
29 SKUs| SKU | Title | Price | Avail |
|---|---|---|---|
| 4648789 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 38-Reg. | CA$350.00 | Yes |
| 4648790 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 40-Reg. | CA$350.00 | Yes |
| 4648791 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 42-Reg. | CA$350.00 | Yes |
| 4648792 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 42-Long | CA$350.00 | Yes |
| 4648793 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 44-Reg. | CA$350.00 | Yes |
| 4648794 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 44-Long | CA$350.00 | Yes |
| 4648795 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 46-Reg. | CA$350.00 | Yes |
| 4648796 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 46-Long | CA$350.00 | Yes |
| 4648797 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Charcoal - 48-Reg. | CA$350.00 | Yes |
| 4648798 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 36-Reg. | CA$350.00 | Yes |
| 4648799 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 38-Reg. | CA$350.00 | Yes |
| 4648800 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 40-Reg. | CA$350.00 | Yes |
| 4648801 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 42-Reg. | CA$350.00 | Yes |
| 4648802 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 42-Long | CA$350.00 | Yes |
| 4648803 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 44-Reg. | CA$350.00 | Yes |
| 4648804 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 44-Long | CA$350.00 | Yes |
| 4648805 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 46-Reg. | CA$350.00 | Yes |
| 4648806 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 46-Long | CA$350.00 | Yes |
| 4648807 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Chocolate/espresso - 48-Reg. | CA$350.00 | Yes |
| 4648808 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 36-Reg. | CA$350.00 | Yes |
| 4648809 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 38-Reg. | CA$350.00 | Yes |
| 4648810 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 40-Reg. | CA$350.00 | Yes |
| 4648811 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 42-Reg. | CA$350.00 | Yes |
| 4648812 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 42-Long | CA$350.00 | Yes |
| 4648813 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 44-Reg. | CA$350.00 | Yes |
| 4648814 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 44-Long | CA$350.00 | Yes |
| 4648815 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 46-Reg. | CA$350.00 | Yes |
| 4648816 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 46-Long | CA$350.00 | Yes |
| 4648817 | Stretch Responsible Wool Suit Jacket London Fit - Semi-Slim - Blue - 48-Reg. | CA$350.00 | Yes |