By Collette Lyons

Bag yourself the best bargains with our indispensable guide. 

If you have to lie on the changing room floor and enlist the help of a coat hanger to do up those jeans, if the shop assistant has to be Prince Charming to your Ugly Sister with the last pair of size 5 skate boots or your brand new New Year's resolution is to drop half a stone to fit that too-small body-con dress, then before you reach the till stop and repeat after me: if it doesn't fit, it's not a bargain.