Wrap the measuring tape around the fullest part of your chest, keeping the tape parallel to the ground. Make sure the tape is not too tight or too loose.
Measure from the highest point of the shoulder (where a shoulder seam would sit) straight down to your desired length. For a shirt, this typically means measuring to the bottom hem.
Measure across the back from one shoulder point to the other. The shoulder point is where the shoulder seam meets the sleeve seam.
If you're between sizes, we recommend going for the larger size for a more comfortable fit. You can always get the garment altered if needed.