
Le 31 x Thomas Mason
Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit
This Le 31 by Simons solid poplin shirt is a white long-sleeve button-down shirt made in Canada in a standard fit with a straight waist and shoulders and regular-fit sleeves. It is constructed from 100% Giza 87 Egyptian cotton St. James poplin and features a spread collar, center button placket, single-button barrel cuffs, and genuine Madagascan mother-of-pearl buttons. The buttons are delicate, and the garment should not be put in the dryer.
- Material
- 100% cotton weave; Giza 87 Egyptian cotton
- Style
- classic, regular-fit
- Category
- Apparel & Accessories > Clothing > Shirts & Tops
Specifications
Exclusive Canadian-made solid poplin shirt in Giza 87 Egyptian cotton with a standard fit and mother-of-pearl buttons.
Densely woven Giza 87 Egyptian cotton poplin, deep luminous dye, remarkable drape, soft silky feel, standard fit with regular-fit sleeves, genuine Madagascan mother-of-pearl buttons, made in Canada.
- Material
- 100% cotton weave; Giza 87 Egyptian cotton
- Style
- classic, regular-fit
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Shirts & Tops
Additional Attributes
- solid poplin shirt
- exclusive Le 31 by Simons collaboration designed in Canada
- densely woven poplin construction
- made exclusively from Giza 87 Egyptian cotton
- dye delivers deep, luminous and lasting colour
- sophisticated fibres provide remarkable drape
- soft, silky hand feel
- standard fit with a straight style at the waist and shoulders
- regular-fit sleeves
- 100% cotton weave
- made in Canada
- genuine Madagascan mother-of-pearl buttons
- delicate mother-of-pearl buttons require avoiding the dryer
Product Insights
100% cotton St. James poplin made exclusively from Giza 87 Egyptian cotton. Standard fit is straight through the waist and shoulders with regular-fit sleeves. Sixteen variants cover both colours across all eight collar sizes, all in stock at the same price. Giza 87 extra-long, fine fibres support fine strong yarns, soft silky feel and deep luminous colour. 375 CAD buys a made-in-Canada exclusive with Giza 87 cotton and mother-of-pearl buttons at flat pricing across variants. Requires ironing and careful button care; not a no-iron, dryer-friendly shirt.
Verified claims
- product_identity
- Men's solid poplin dress shirt from Le 31 by Simons x Thomas Mason, made in Canada.
- material
- 100% cotton St. James poplin made exclusively from Giza 87 Egyptian cotton.
- fit
- Standard fit is straight through the waist and shoulders with regular-fit sleeves.
- sizing
- Sizes 145–180 are collar sizes in inches multiplied by ten, spanning roughly 14.5–18 in collars and 36–46 in chest.
- variant_selection
- Sixteen variants cover both colours across all eight collar sizes, all in stock at the same price.
- collar
- Pointed spread collar with visible collar stand and top button.
- cuffs
- Single-button barrel cuffs.
- buttons
- Genuine Madagascan mother-of-pearl buttons; brand warns they are delicate and the shirt should not go in the dryer.
- button_care
- Protect shell buttons from acids, high heat, harsh dry cleaning and rough tumbling.
- care
- Machine wash cold on delicate, do not bleach, hang to dry, and iron with or without steam; professional cleaning is also listed.
- wrinkling
- Dense cotton poplin with no wrinkle-resistant finish will show soft creasing over a workday.
- fabric_behavior
- Dense poplin weave gives good opacity, a smooth surface and a dry, crisp hand.
- fibre_quality
- Giza 87 extra-long, fine fibres support fine strong yarns, soft silky feel and deep luminous colour.
- drape
- Described as having remarkable drape and a soft, silky feel.
- styling
- Versatile dress shirt: spread collar, smooth poplin and solid colour work for business and smart-casual outfits.
- value
- 375 CAD buys a made-in-Canada exclusive with Giza 87 cotton and mother-of-pearl buttons at flat pricing across variants.
- tradeoffs
- Requires ironing and careful button care; not a no-iron, dryer-friendly shirt.
- durability
- Dense poplin and Giza 87 fibres point to durable construction, but mother-of-pearl buttons are the fragile point.
- measurement_guidance
- Measure collar at top button to buttonhole, chest under arms over shoulder blades, and sleeve from centre back neck to wrist.
- label
- Inside labels show Thomas Mason branding and '31 par Simons 15.5 39 coupe standard / standard fit.'
Product record
- Title
- Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit
- Brand
- Le 31 x Thomas Mason
- Price
- 375 CAD
- Availability
- In stock
Buying Guide
0 comparisons · 1 sourceUses
A tucked-in shirt look for the office or dressed-up days
This white long-sleeve poplin shirt is shown styled tucked into trousers, giving a clean, put-together look for dressier or office wear. In the styling, the tuck sits smooth at the waistband with a slight fabric blousing above the belt, so the standard fit drapes naturally rather than pulling tight.[1]
Image Analysis
2 images- 01

Product
Front view of a white long-sleeve button-down dress shirt worn tucked into trousers; visible features include spread collar, center button placket with cream buttons, single-button barrel cuffs, and smooth poplin fabric with shoulder seams.
- Overall garmentWhite long-sleeve dress shirt, worn tucked into trousers, shown from the front with full torso visible down to the hips.
1 region
x 0.12 · y 0.08 · w 0.76 · h 0.64 (high) - Collar stylePointed spread collar with visible collar stand and open top button, collar tips resting flat.
1 region
x 0.33 · y 0.06 · w 0.34 · h 0.12 (high) - Center placket and buttonsVertical center placket with a single column of light cream buttons evenly spaced from collar to hem.
1 region
x 0.41 · y 0.14 · w 0.18 · h 0.50 (high) - CuffsSingle-button barrel cuffs with visible seam and slight gathering at the wrist; left cuff mostly visible, right cuff partly covered by hand in pocket.
2 regions
x 0.10 · y 0.64 · w 0.17 · h 0.22 (high); x 0.73 · y 0.58 · w 0.14 · h 0.22 (high) - Fabric appearanceSmooth, tightly woven poplin-like fabric with a matte finish and minimal visible texture; slight folds and creases at the waist and sleeve bends.
1 region
x 0.20 · y 0.18 · w 0.60 · h 0.46 (high) - Shoulder constructionVisible shoulder seam running from the collar to the sleeve, seam sits at the model's shoulder line.
1 region
x 0.20 · y 0.12 · w 0.62 · h 0.12 (high) - Hem and tuckShirt is tucked into the waistband, with smooth tuck and slight fabric blousing above the belt.
1 region
x 0.20 · y 0.56 · w 0.60 · h 0.18 (high)
Other
Studio lifestyle shot showing a male model wearing the shirt against a plain light gray background; model stands facing forward with one hand in a trouser pocket, black belt and black trousers visible, soft even lighting and minimal shadows.
- Model and poseMale model facing the camera in a three-quarter frontal stance, left hand in right trouser pocket and right arm relaxed at side.
1 region
x 0.06 · y 0.00 · w 0.88 · h 1.00 (high) - Visible accessories and pantsBlack leather belt with silver oval buckle and black trousers visible at the waist; belt sits over the tucked shirt.
1 region
x 0.28 · y 0.62 · w 0.44 · h 0.18 (high) - Background and lightingUniform light gray studio background with soft, even lighting and minimal directional shadows.
- Image crop and framingImage framed from just above the head to mid-thigh, centered composition with the model occupying the central vertical axis.
- Small shadow and reflectionSubtle shadowing under the chin and slight shadow on the left side of the torso, indicating soft frontal lighting.
1 region
x 0.36 · y 0.14 · w 0.28 · h 0.10 (medium)
Colors
white· shirt- Overall garmentWhite long-sleeve dress shirt, worn tucked into trousers, shown from the front with full torso visible down to the hips.
- 02

Product
Neatly folded long-sleeve white dress shirt shown from above; spread collar visible, full front placket with four round cream-colored buttons, and a folded barrel cuff on the left side. Two fabric labels are visible inside the collar area.
- Overall presentationShirt is flat-folded with the front facing up, collar at the top, left sleeve folded neatly across the lower left portion of the body, and the right sleeve hidden beneath the fold.
1 region
x 0.06 · y 0.03 · w 0.88 · h 0.94 (high) - Collar stylePointed spread collar with visible topstitching along the collar edge and a smooth, slightly rounded collar stand.
1 region
x 0.24 · y 0.02 · w 0.52 · h 0.20 (high) - Front placket and buttonsCenter front placket with four vertically aligned round four-hole buttons; stitching visible where each button is attached.
1 region
x 0.42 · y 0.18 · w 0.28 · h 0.72 (high) - CuffSingle folded barrel cuff positioned on the lower left of the folded shirt with two buttons visible on the cuff placket and neat topstitching around the cuff edge.
1 region
x 0.07 · y 0.62 · w 0.26 · h 0.32 (high) - Fabric appearanceSmooth, fine-woven plain poplin texture with a matte finish and minimal visible weave from this distance.
1 region
x 0.12 · y 0.22 · w 0.76 · h 0.66 (medium) - Upper collar labelBlack rectangular label with light-colored text and numerals centered inside the collar.
1 region
x 0.40 · y 0.10 · w 0.20 · h 0.08 (high) - Lower collar labelSmaller white rectangular label beneath the black label with stacked text lines.
1 region
x 0.41 · y 0.17 · w 0.18 · h 0.09 (high) - Label text: brand line“THOMAS MASON”
1 region
x 0.41 · y 0.19 · w 0.18 · h 0.05 (high) - Label text: fabric line“FABRICS / TISSUS”
1 region
x 0.42 · y 0.23 · w 0.16 · h 0.04 (high) - Black label text (partial)“31 PAR SIMONS 15.5 39 COUPE STANDARD / STANDARD FIT”Partial
1 region
x 0.38 · y 0.10 · w 0.24 · h 0.07 (medium)
Other
Studio product shot taken from above on a neutral light-gray background with soft shadowing beneath the folded shirt; even diffuse lighting minimizes harsh highlights.
- Shot compositionTop-down flat lay framing with the shirt centered and generous margins on all sides.
- Background and shadowUniform pale gray background with a subtle soft shadow to the lower-left of the shirt indicating overhead diffuse lighting.
- Image qualityHigh-resolution, evenly lit image with sharp focus on collar, placket, and cuff; minimal visible noise.
Colors
bright white· shirt bodycream· buttonsdeep black· upper collar labellabel white· lower collar label- Overall presentationShirt is flat-folded with the front facing up, collar at the top, left sleeve folded neatly across the lower left portion of the body, and the right sleeve hidden beneath the fold.
Variants
16 SKUs| SKU | Title | Price | Avail |
|---|---|---|---|
| 4745913 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 145 | CA$375.00 | Yes |
| 4745914 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 150 | CA$375.00 | Yes |
| 4745915 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 155 | CA$375.00 | Yes |
| 4745916 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 160 | CA$375.00 | Yes |
| 4745917 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 165 | CA$375.00 | Yes |
| 4745918 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 170 | CA$375.00 | Yes |
| 4745919 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 175 | CA$375.00 | Yes |
| 4745920 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - White - 180 | CA$375.00 | Yes |
| 4745921 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 145 | CA$375.00 | Yes |
| 4745922 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 150 | CA$375.00 | Yes |
| 4745923 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 155 | CA$375.00 | Yes |
| 4745924 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 160 | CA$375.00 | Yes |
| 4745925 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 165 | CA$375.00 | Yes |
| 4745926 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 170 | CA$375.00 | Yes |
| 4745927 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 175 | CA$375.00 | Yes |
| 4745928 | Solid Poplin Shirt An Exclusive Collaboration Made In Canada Standard Fit - Baby Blue - 180 | CA$375.00 | Yes |