There is a lot of overlap in the sizing of the TowelTopper because of the elastic in the back and the 4" of velcro in the front. Unlike most products, one size does not fit most. That's why we created sizes. As a general rule, go with whatever size you would purchase in a T-Shirt. Remember, the TowelTopper is worn below the armpits and above the chest, so do not go with cup size. And if you fall between two sizes, opt for the smaller of the two.
The extra small fits young girls around the age of 4 and older.