Instore there is a promotion of an outfit for £10 which consists of top(s) and jeans. They are also offering £5 off wys £25 which works before discount.
So spend £25 on the items before discount and get £5 off making it £15 for 2 jeans and tops. Make sure if you are buying more than a couple you figure out if you can use more than one voucher too.
You could essentially get 3 outfits for £20 pounds if you bought the more expensive jeans and tops, using two of the vouchers.