Understand how you feel, but agree that you shouldn't worry as long as the other lady won't be wearing the outfit to your dd's wedding. Wear what you love and enjoy dd's big day!
But be more careful, from now on, about what you show your (so-called) "best friend." Or if you want to make sure she doesn't repeat it/show it to someone else, tell her. Don't trust her to keep something confidential if you haven't asked her to. Lesson learned.
Six foot two, eyes of blue. kg v lb. cm v ft + ins