There is a metal zipper as a closure along with a hook and loop. There is no maker or size label in these shorts. I would say that this fabric is a blend of rayon and silk. These are in excellent vintage condition.
Inseam: from inside crotch seam to end of hem: 30-1/2 inches. Outseam: from the top of the outer waist to the end of the hem: 43 inches. This item is made of rayon and silk.