Contact them.
No you have to call the customer service online get a RMA number so you can send it back I had to do the same thing it's expensive to ship back too.i paid more for the shipping then the dress itself.
Two choices: Contact them, spend more, or, Lose weight, you're only gonna wear it one day! Either way you'll look great!! CONGRADULATIONS
If they have the size in stock if not you have to do alterations
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