How do I know my suit jacket size?

Suit and sport coat sizes have one number and one descriptive word (for example, 38 short, 40 regular, 42 long). The number refers to your chest measurement, and the descriptive word refers to the length of the jacket.

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What size is a 40R suit jacket?

Men’s Suit Size Chart
Coat Chest Waist
40R 38 – 40 30 – 34
41R 39 – 41 31 – 35
42R 40 – 42 32 – 36
43R 41 – 43 33 – 37