Ah viva suit. I'm female, so it's slightly different. And I'm probably going to be using a wheelchair on the day (and self wheeling), so something practically comfortable is rather important. Will give that some thought.
Good luck with the mock viva. And good tips again. My external has a book out I've put an order in for, but goodness knows if I'll get it in time. None of the local libraries have copies. Well I tried :p