I have never requested a lady to wear something special for me. I like to be surprised and I think the lady will wear what she likes and what she thinks will impress me so she will feel happier in what she is wearing.
Having said that I do love to see a lady in a sexy dress and then to be asked to help her out of it revealing some really sexy lingerie
I don't really see the attraction of uniforms but I suppose they can be fun sometimes.