BUST 
measure the widest part of your bust

UNDER BUST
measure underneath your bust

WAIST
measure the smallest part of your waist

HIPS
measure the widest part of your hip/bum

WAIST TO HIP 
measure the length from your waist to the widest part of your hip/bum

TORSO
measure from your collar bone to further part of your crotch

NAPE TO WAIST
measure from back of neck down to your waist

DESIRED LENGTH OF TROUSERS (INSEAM)
measure the inside of your leg from crotch to where you would like the trousers to end

DESIRED LENGTH OF SKIRT/DRESS
measure from your waist to where you would like the skirt/dress to end

DESIRED LENGTH OF GOWN
 measure from your waist to floor with heels on (if you plan on wearing heels)