How are men’s shirts measured?
Tips for measuring your shirt: Measure from the middle of the button hole to the center of the collar button. To measure the chest, button the shirt and lay it flat. Then, measure from edge to edge just below the armpit and double the number. The waist of the shirt will be the most narrow point.
How do I know my shirt size without measuring?
If you don’t have a ruler, you can measure lengths with standard objects like printer paper or a dollar bill. Or, approximate lengths using your hand and arm.