Thanks for the information
The difficulty with this is that it is not the shop’s fault that you cannot use the dress.
If you do cancel you are in breach of contract.
However, they have provided no consideration for this contract unless, of course, they have to order the dress or alter it. If so, you are liable in full. If not, they still have the dress to sell or can not make it.
So you would be liable for some administration costs but no more.
Hope this helps. Please let me know if you need more information.
Can I clarify anything for you?
Hopefully, I have answered your query in a way that is simple and easy to understand. If anything remains unclear, I will be more than happy to clarify it for you. In the meantime, thank you once again for using our services.