A - Chest: Measure with your arms hanging straight down at your sides. If you're buying a jacket/top, this measurement is most important.
B - Waist: Measure at the narrowest point.
C - Hips: Measure at the widest point. If you're buying pants/bottoms, this measurement is most important.
D - Inseam: Measure on the inside, from the crotch down to the floor.
E - Arm Length: Measure from the shoulder, over the elbow, to the wrist with the arm slightly bent.
It can be challenging to measure yourself accurately, so it's a good idea to get help from someone else. Tip: If you don't have a measuring tape, you can use a string or rope and then measure it with a ruler afterward.
In cases where the chart indicates that different sizes fit different parts of the body, which is very common, you are the best judge of which priority to give. It's also important to consider whether you prefer a slim or loose fit, especially if you are between two sizes.