Wedding dress deposit can i get a refund?

I tried a dress on last night and fell in love, however the dress was 3 sizes to small and I was pinned in and it didn’t fasten at the back. The sales lady told me that my large chest wouldn’t be an issue as the seamstress would put support in the correct size dress and all would be fine. I paid £800 deposit. When I got home my maid of honor sent me the pictures and I suddenly realised it was a a completely backless dress even in the right size, I knew that there was no way the seamstress could add the support that I needed. I called the seamstress this morning and sent over the pictures she confirmed that there was no way I would get the right support and she would never of even showed a bride with a big cheat this dress.


I called the shop as soon as they opened and stopped them ordering the dress from the designer and a different lady said she agreed it would not be suitable for me. They are now saying I can transfer the £800 to another dress and when I asked what happens if I can’t find one, there not willing to discuss that. Where do I stand as I signed a contract to say non refundable deposit but I know they haven’t ordered the dress and I feel it would not be for for purpose, am I covered by the consumer rights act?