Women

Bust  With arms relaxed at your sides, measure the fullest part of your bust, keeping the tape parallel to the floor.
Natural Waist Measure around the waist at the narrowest part of your torso, keeping tape parallel to the floor and one finger between tape and your body.
Hips Stand with your heels together and measure around the fullest part of your hips, keeping the tape parallel to the floor.

Men

 Chest With arms relaxed at your sides, measure the fullest part of your chest, keeping the tape parallel to the floor.
Body Length Measure from center back from base of neck to hip.
Neck Measure at the base of your neck (at Adam’s apple), keeping tape a bit loose.
Sleeve Length Bend your elbow 90 degrees and place your hand on your hip.  Hold the tape at the center back of your neck.  Measure across your shoulder to your elbow, and down to your wrist. The total length is your sleeve length.
Waist Keep one finger between tape and body, measure around body where pant waist normally rides.  For wearing comfort measure over shirt, not over pant.
Hip Stand with your heels together and measure around the fullest part of your hips, keeping the tape parallel to the floor.