Here’s a great project I found in Modes et Travaux august 1950.
Model no. 15 calls for a jersey or light wool plaid. The extreme points are folded in and sewn so you can pass a thin belt of the same fabric. Model no. 16 suggests silk. Two bands cut on the bias sewn together to form a chevron leaving a space open on each side in which the arms can go through. Model no. 17 very sporty with a tie belt and pocket on one end. Model no. 18, more dressy, reversible. Cut two bands on the bias in silk or crèpe in two opposing colors.