How to measure a garment
The best way to determine your fit is to measure a garment that you currently own that fits you well. Lay the garment on a flat surface and ensure that you keep the tape measure straight and not too tight or too loose.
This measurement is taken from the neck shoulder point (where your neck and shoulder meet), to the bottom hem.
This measurement is taken by placing the measuring tape 2cm below the armpit and taking the measurement across the width of the chest.
This measurement is taken at the back of the shirt, from below the collar to the bottom hem.