It seems to be less and less people every year. I remember the first time I saw the Manics in 2004 and there was quite a large bunch of people in home made T-shirts, sailor suits, etc. It was great to see.
I'll probably dig out my awful home made t-shirt that I've worn at all but one of the gigs I've been to, put on a few beady bracelets and bring a blue feather boa
Last time I did all this in December 2007 though a group of drunken guys behind me thought it amusing it constantly push into me and jab me in the back every now and then and come out with a few stupid comments, which made me think twice about dressing up a bit but oh well.