Measure around base of the neck.
Measure from the center back of your neck (at your spine) to the end
of your shoulder at the top of your arm.
CHEST :Wrap the tape measure under your armpits, around the fullest part of your chest.
WAIST :Use the tape to circle your waist (sort of like a belt would) at your natural waistline, which is located above your belly button and below your rib cage.