Blacksheep's right on with his description of 'uniform'. Keep 'em 'S' and no one minded - at all! My last four years on the line, Cottesmore and Waddington, I had the luxury of wearing (acquired) aircrew thick cotton shirts, collar attached, a rather nice thick knitted tie with a squared off end, and a 'proper' King's cap badge - uncle Arthur's I think, from his time sitting on top of Lancasters.
I've posted this before, but overseas Khaki Drill uniform was no better. See Chiefy on the right. His almost white KD says he's 'been around'. The Australian bush hat, second left back row, I think is still upstairs.