cotton

To determine your chemisette size, measure the distance between your bra straps, from one outer edge to the other outer edge). If you find your measurement falls right on the line of two sizes, go with the smaller size.
Measured Width	Chemisette Size
8 - 9.25 inches	small
9.25 - 10.5 inches	medium
10.5 - 12 inches	large
12+ inches	x-large
The elastic band that loops around the button stretches to allow the chemisette to fit various sizes. The outer edges of the chemisette should not go on top of or outside the outer edge of the bra strap or it may not stay attached and may not lay flat.