Question 1

How do suit jacket sizes work?

Accepted Answer

US and UK suit jacket sizes usually match your chest measurement in inches — so a 40 inch chest typically corresponds to a US or UK size 40 jacket. EU sizes are typically about 10 numbers higher than the equivalent US or UK size, so a US 40 roughly translates to an EU 50, though the exact offset can vary slightly between brands. Alpha sizes like S, M, L and XL map loosely to numeric ranges: a size M usually covers US 38-40, while size L covers US 42-44.

Question 2

What do short, regular, and long mean?

Accepted Answer

Short, regular, and long describe the jacket length and overall proportions rather than the chest size. Short is designed for men under about 5'8" or those with shorter torsos, regular fits average heights roughly 5'8" to 6'0", and long is for men over about 6'0" or those with longer torsos. Choosing the correct length is as important as picking the right chest size, since an ill-fitting body length affects how the shoulders, sleeves, and waist of the jacket align with your frame.

Question 3

Should a blazer be tight across the chest?

Accepted Answer

No, a blazer should not be tight across the chest. When buttoned, the fabric should lie flat without pulling into an X shape across your chest or creating horizontal wrinkles between the buttons. The shoulder seam should sit exactly at the edge of your natural shoulder bone, neither hanging off nor digging in. You should be able to move your arms comfortably and raise them slightly without the jacket riding up excessively at the waist or pulling across your back.

Chest	US/UK	EU	Alpha	Fit
34-35 in / 86-89 cm	34	44	XS	Slim small frame
36-37 in / 91-94 cm	36	46	S	Small frame
38-39 in / 97-99 cm	38	48	M	Medium frame
40-41 in / 102-104 cm	40	50	M/L	Average frame
42-43 in / 107-109 cm	42	52	L	Large frame
44-45 in / 112-114 cm	44	54	XL	Extra large frame
46-47 in / 117-119 cm	46	56	XXL	Broad frame

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