Made of Cotton Lycra.
Product code: LCTOWL
They come in two sizes, but because of the stretchy material they fit a very big range:
SMALL / MEDIUM – UK 8 / 10 (USA 4 / 6)
MEDIUM / LARGE – UK 12 / 14 (USA 8 / 10)
For both sizes the length from underarm to bottom hem on the side is cm 42 / 16.5″.