Metallic brocaded chiffon evening dress, 1930s
The description of this dress and slip state that both close at the side seam with snaps and hooks and eyes. This answers my question about the correct closure used for a 1930s slip. I’ve seen a few 1940s half slips that had metal zippers in the side seam. I’d have to see how that worked under a period garment. But right now that doesn’t sound good to me.