My daughter bought a dress and after bringing it home, she hates it! Wrong color, wrong style, wrong for her! We did no alterations to it. She has since found the one she really loves. So now, what? PUNKYJUNKY
Can't you return it to the shop where it was purchased?
You could check with local consignment shops in your area. If that doesn't work, ask them where you could sell the dress.
Wedding gowns are sold on ebay too.
Here is a link that might be useful: selling a wedding gown
How about Craig's List? I see lots of wedding dresses sold on there.
Also try the classified ads in your local newspaper. Many brides sell their new or used gowns that way. Unfortunatley, you probably won't get what you paid for it, no matter how you sell it.