Not gonna lie, I get a lot of stuff at reduced price. Usually I would go with the following...
Trainers/shoes: £25 maximum. There's always stuff like Nike and Adidas in the sales, and pretty much anything of those brands can be seen as 'acceptable' to an extent.
Bottoms (Jeans/Trousers): Below £10, branded or not.
Jackets, coats, and jumpers: £25 maximum. Usually branded stuff from the sales as this sort of thing from the likes of Primark aren't often good quality.
T Shirts or other sleeveless items (e.g. Polos, etc): Less than £10, branded or not.
Other sleeved items (sweaters, cardigans, knitted stuff): Around £10.
Undies last ages, but a few pound for them.
What do you all spend per type of clothing?