I bought a dress in there yesterday, very nice too, it cost £55. I got home to a flier on the doormat advertising 20% off this Thursday. My question is - can I take the dress back on Thursday and ask for my 20% off!???
You could try. If they say no, I'd be tempted to see if there was another one in my size, buy that then return the original for a refund. If there isn't one in your size, return the original, then ask to buy it again.