A few measurements make choosing your shirt a little easier.

1. Check the product's size guide

   Use the chart on the shirt you want. Check whether it lists body or garment measurements, and whether the units are inches or centimeters.

2. Compare with a favorite shirt

   For garment measurements, lay your shirt flat. Measure the width from armpit to armpit and the length from the highest point of the shoulder to the hem. Double the width only if the chart asks for circumference.

3. Choose the room you like

   Match your measurements to the chart and consider whether you prefer a closer or roomier fit.