it depends what it is really.
at the moment i'm buying myself at least one piece of clothing a month from
www.tshirthell.com, and i happen to be wearing one at the moment

they cost me about £17-£25 each.
i spend up to £40 on shoes, which invariably are vans, since i find them exceptionally comfortable, though i do own a pair of swear ankle boots/trainers as well as owning various pairs of smart leather ankle boots, and some steel toes for walking, working on the car, etc etc.
i mostly wear jeans, of which i spend a grand total of £5 on each pair, from matalan. i couldn't give a shit if they had levi or wrangler or whatever on them, it's all denim. i own about 20 pairs of jeans, in different sizes.
i do own some quicksilver jeans, which i love, and they cost me £35.
my last pair of sunglasses just got stolen, they were rectangular lensed kangol sunglasses. i'm thinking of buying me a pair of oakley sunglasses, but i don't wanna spend any more than about £80
i will spend up to £200 on coats. i love coats. my best one, i made. and it cost about £250 in material alone. at £40 a metre for the most awesome purple velvet, and the crease resistant specialist material, and all the buttons, yeah it cost quite a bit

hehehe
i have bought new rock boots in the past, costing me £160, but i rarely wore them. i want to buy a small ankle pair, but i'd rather have a pair of swear boots i saw, but i can't find them anywhere now.
underwear, YSL or Calvin klein butterfly boxers.
socks, black cotton sports socks.