The other SD Hat shaper was one of the shelves in the ubiquitous OM desks.
At Waddington we had a professional flying officer, an AEO who declined to pass the promotion exam for flight lieutenant. In the far one night he waz acosted by the PMC for not wearing an approved lounge suit. He was wearing a very smart number styled like a No 1 jacket. A light coloured cloth, 4 black buttons and I think sewn straps a bit like webbing down to the belt.
When he returned he was then wearing a scarlet red waistcoat.
You couldn't win.