I hate to be pedantic, but grobags for crabs is/are uniform. Should you consult AP 1358 - RAF Dress Regulations, you will find at Chapter 6 that flying suits are No 14 Home Dress. Even the awful, posy biker jacket is there as No 14C. Nuff said?. .. .Shouldn't AG know that,rather than have to be told by a gentleman aviator such as ...... moi!