how do you tell what size a suit is on the tag?

Answer 1

men's clothing is all sized by measurement. I believe a suit is measured by your chest size and the length. like a 38R suit, would be how big around you are at your chest and is regular length. The make Tall and short sizes as well.

you need to measure for jackets in 2 places:

Step 1: Measure your chest with the tape measure underneath your arms, across the shoulder blades, and over the largest part of your chest. The chest measurement is usually the size of the coat. You may add 1 inch to the measurement for a more relaxed fit.

Step 2: Measure the overarm with the tape measure around your shoulders with your arms down. Read the number you get and subtract 7 inches. For instance, if the measurement you get on the overarm is 49 inches, subtract 7 to get 42 (49 - 7 = 42).

The overarm measurement is important particularly if it is larger than the chest measurement. In this instance, you will need to fit your chest and upperarm rather than rely simply on the chest measurement alone. For instance, if your chest measurement is 40 inches and the overarm measurement is 49 inches (remember: subtract 7 from the overarm measurement), you likely will want to start with a size 42 coat to accommodate your larger upper arms and shoulder width.

For pants you just need to know your waist size and length of the pants.

That's it!