100% cotton, beige, impregnated with starch (stiffened), fabric construction of Ypsilon (single thread): warp 9.5 threads (Nm 60)/cm, weft 6.5 threads (Nm 60)/cm; fabric construction for Beta (2 threaded); warp 17.5 threads (Nm 60)/cm, weft 7.0 threads (Nm 60)/cm