Is shirt size same as chest size?

It’s easy, take your chest measurement (widest part of your chest). Just add 4-5 inches for space and total is your Shirt chest length. This is for the slim fit. If you want loose fitting, add 5-8 inches to the chest length.

Which size is M or L?

“M” (medium), “L” (large), “XL” (extra large), “XXL” (extra extra large).

Is 40 chest medium or large?

M&S 40 is a medium.

Is a 40 an XL?

The roman numerals related to XL are given below: XL = 40. XLI = 40 + 1 = 41. XLII = 40 + 2 = 42.