Medium is the size of a normal hair tie band. It fits wrists between 5-6.4" around. Small is better for younger girls and small teens. It fits wrists under 5" around. Large is sized for wrists 6.5-7.5"
Carleigh (18 years old) is 5’6” with the following: 34B bust 27” waist 37” hips
Nicole (43 years old) is 5’7” with the following: 34D bust 28” waist 37” hips