long sleeved evening party wears

, does anybody have any formal, ball or party dresses to donate to a good cause, I'm collecting dresses for a collection Mairehau High are creating for girls who can't afford to buy dresses for their Balls/social/prom. It's a shame they have to miss out on this wonderful experience. I'd be very grateful (and I'm sure they would too if we could all look in our wardrobes)(and our teenage daughters wardrobes) and donate something pretty or chic they could wear... No size too big or too small long sleeved evening party wears :)