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need an excuse to return it

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ok this might be long but please read it + help me...
I needed a black skirt for a fancy dress party and on the day of the party I went shopping for one, I looked everywhere and I could only find one in topshop which was £16, so I bought it and wore it to the party. But this morning I went on the topshop website and it says the skirt it £14, so I payed more than I could of, and the skirt it not something im ever likely to wear again, I think its a complete waste of money now that I have got it but I pulled the tags out and wore it. I now would like to return it but I dont know what to say, like what excuse to use? I was thinking maybe something like, get my mum to take it back and say 'I bought this for my daughter for a party and she pulled the tag out before trying it on and when she tried it on she realised it didnt fit her' is that alright or can anyone think of something better?
thanks x