I've not been running long and have never raced before. I normally wear the same old jogging bottoms & tshirt - what should i wear for the race tho? I'm anticipating a v.slow time (knee injury so may be walking a fair bit/lot). Is it ok to wear my fave trousers (too hot?), or should i get some shorts? If so who makes good longer ladies styles (i'm quite tall & hate short shorts)?