http://dearwendy.com/updates-one-dress-two-dress-responds/
Bridesmaid said she'd be in her friends wedding, bought a dress (a year before the wedding). Eventually found out she was pregnant and her due date was right around the wedding. Once she realizes she won't make it to the wedding, tells her bride friend, and the bride replaces her with someone else. They can't get the same dresses so she makes everyone (the other 5-6 bridesmaids) buy a whole new dress for 400 dollars!