Men's Clothing Size Guide: Shirts, Trousers & Suits

Updated: May 27, 2026

Men’s Casual Tops (T-shirts, Sweaters, Casual Shirts)

Sized by chest measurement:

US / UK	EU	Chest (in)	Chest (cm)
XS	42	30–33	76–84
S	44/46	34–37	86–94
M	48/50	38–41	97–104
L	52/54	42–45	107–114
XL	56/58	46–49	117–124
XXL	60/62	50–53	127–135
3XL	64+	54–57	137–145

Men’s Dress Shirts

Dress shirts use neck size (collar) and sleeve length instead of chest-based letter sizes:

Neck (in)	Neck (cm)	US/UK Collar	Approximate Letter
14–14.5	35.5–37	14 / 14½	S
15–15.5	38–39.5	15 / 15½	M
16–16.5	40.6–42	16 / 16½	L
17–17.5	43–44.5	17 / 17½	XL
18–18.5	45.7–47	18 / 18½	XXL

Sleeve length: Standard US sleeve lengths are 32–33 (short), 34–35 (regular), 36–37 (long/tall). EU dress shirts use arm length in cm (sleeve from center back to wrist).

How to measure neck: Wrap tape around the base of the neck (where the collar sits), 2 fingers loose. Add 0.5” to the measurement — that’s your collar size.

Men’s Trousers

Trousers are sized by waist × inseam (e.g., 34 × 32):

Waist (in)	Approximate Letter	EU
28–30	S	44–46
30–32	M	46–48
32–34	M–L	48–50
34–36	L	50–52
36–38	XL	52–54
40–42	XXL	56–58

Inseam lengths:

Short: 28–29”
Regular: 30–32”
Long: 33–34” (most common US standard)
X-Long: 35–36” (tall sizing)

EU trouser sizing: Some European brands label trousers with a single EU number that corresponds to the waist measurement in cm. EU 50 trousers ≈ 34–36” waist. For the full US/UK/EU numeric conversion table, see US vs UK vs EU Clothing Sizes.

Men’s Suits

US and UK suit sizes use the chest measurement directly:

US / UK Suit Size	Chest (in)	EU Suit	Body Type Suffix
36	36	46	R (regular), S (short), L (long)
38	38	48	R / S / L
40	40	50	R / S / L
42	42	52	R / S / L
44	44	54	R / S / L
46	46	56	R / S / L
48	48	58	R / S / L

R/S/L suffixes:

R (Regular): Most men 5’9”–6’0”
S (Short): Men 5’7” and under
L (Long): Men 6’1”–6’3”
XL (Extra Long): Men 6’4” and taller

Trouser size for a suit is typically chest size − 6 inches (e.g., a 40R suit → 34” trousers). Trousers can be altered at the waist.

Men’s Outerwear (Coats, Jackets)

Outerwear follows the same letter/EU sizing as casual tops, but sized 1–2 inches larger to accommodate layering:

A man who wears a size L shirt typically wears a size L or XL jacket, depending on:

Whether he wears a suit jacket underneath
Jacket cut (slim fit runs smaller)
Brand (European brands run smaller — especially Italian and Spanish labels)

How Fit Styles Affect Sizing

Modern menswear offers three fit categories, and they change how you size:

Fit	Chest	Waist	Notes
Slim / Skinny	Close to body	Tapered	Size up if between sizes
Regular / Classic	Standard ease	Straight	Most common; standard chart applies
Relaxed / Athletic	Extra room in chest/shoulder	More room in hips/thighs	Size down if between sizes

For athletic builds (wide shoulders, narrow waist): chest usually determines size for shirts. Trousers may need waist alteration.

Use the Clothing Size Calculator — enter chest and waist for instant US, UK, and EU results.