I'm not from the Cincinnati area, so I can't help you with stores, but can you maybe give us a little more detail about the wedding? Is it in the morning, afternoon, or evening? Is it black tie, semiformal, or informal?
I don't think that you could go wrong with a sheath dress in a pastel color, or a pretty floral or toile pattern! Something in shantung (raw silk) would be lovely, fairly formal, and breathable (so you don't get *too* hot).
Hope you find something gorgeous!
