Need Prom Dress

I`m looking for a unique prom dress that has a Medieval or Renaissance look, but isn`t very heavy and made with tons of material. Most girls opt for shimmering/sparkling strappy or strapless dresses in bright colors, so I`d like to blend in a little and not stick out like a sore thumb. I`m not a big fan of bright pink or purple though... I`m just out for something that won`t make me sweat to death (since it will be warm) but still has sort of a fantasy flair. ANY SUGGESTIONS WOULD BE MARVELOUS!! Thanks!