Measure your bust at the fullest point, make sure the tape doesn't slip at the back
Take your waist measurement, make sure it is comfortable.
Measure round your body 6cm below the natural waistline
Make sure you measure the widest part of your hips (usually 21cm from your natural waist)
Measure the back width 15cm down from your neck bone. (armpit to armpit)
Measure the chest 7cm down from your neck point. (armpit to armpit)
Measure from the neck to the shoulder bone.
Measure round your neck, don't forget to touch that collar bone.
Bend your arm, and measure those biceps
Measure around your wrist, leaving space to move.
Measure your ankle, just above the ankle bone
Lastly measure around your leg, just above the ankle