Chest - Measure the total circumference of your chest at its fullest point, just under your armpit.
Waist - Place your hands on your hips and bend to the side. The indent on your side as you bend is your natural waist. Measure the total circumference at this point.
Waist (bottoms) - Measure your circumference at a point about two inches below the belly button.
Hip - Stand with your feet 6" apart. Measure the total circumference at the fullest point of your hip.
Arm Length - With your elbow slightly bent, starting at your middle neck bone, measure to the point of your shoulder and down to your wrist bone. Or take a shirt that fits well and take the same measurement.
Inseam - Stand with your feet 6" apart. Measure from the top of the leg/crotch to below the ankle. Or take a pair of pants that fit well and take the same measurement.