Take measurements around the fullest part of the chest, keeping the tape horizontal.
Take measurements around the narrowest part of the waist (usually below the ribs), keeping the tape level.
Take the measurements around the fullest part of the hips, keeping the tape horizontal.
Take measurements from the top of the crotch to the ankle.
If your measurements straddle two sizes, choose the smaller size for a more fitted fit, or the larger size for a looser fit. If your bust size and waist size are two different sizes, order the size listed for your bust size instead.