Gentlemen, I have been attending Senior Rates mess functions since '92 always in mess undress. At a rescent dinner a colleague of mine turned up in mess undress with a waistcoat!!! Now I am no expert on the subject, but I'm sure some of you are. Is this a recognised rig for a senior rate at such a function? The only reason I ask is that it is the first time I have seen it done! Your advice would be much appreciated.