I bought a bustier for my wedding. Personally, I thought it was sexy as hell. It sorta sucked me in a little bit - made me stand up straighter...and it made my boobs look just a teeny bit bigger...all things I thought I needed in order to pull off my dress.
The day of the wedding came and the bustier didn't work. I tried it on at the bridal boutique, and it fit flawlessly...yet in "real" life it kept showing when I would walk and move. AND it actually gave me back cleavage... yuck. So...I took it off moments before the ceremony. Doing so instantly removed my back fat...and helped me breath a bit better...which was priceless. I didn't even end up feeling self conscious without it :-) I felt pretty!
That was the biggest waste of money in our whole wedding event - my damn bustier. I think it even got left behind at the venue.
Did you spend money on a major fail for your wedding?