Hips
Measure the full circumference at the widest/fullest part of the hips
Underbust
Measure the full circumference under your bust
Inside leg
Regular Length: Fits heights around 5'6" (170 cm)
Short & 7/8 Length: Fits 5'4" (165 cm) and under.
Long Length: Fits 5'8" (175 cm) and taller.