Taking your measurements
Measure where the top of your collar would be. This is the key measurement for shirts.
To measure your chest or bust, wrap a tape measure around the fullest part of your chest.
To measure your waist, wrap the tape measure around your natural waist, which is usually the smallest part of your waist.
To measure your hips, wrap the tape measure around the fullest part of the top of your hips.
To measure your inseam, measure from top of inside leg at the crotch to ankle bone.