There was a chap at Catterick who was still insisting on wearing his mess "overalls" as I believe they were called, even though they had officially gone out by then (1965). I thought they looked the business, very tight, with the elasticated foot straps to stop them riding up, and worn with patent leather ankle boots, as opposed to shoes.
This chap was tall and slim - they probably wouldn't have looked so good on a portly AVM!