Just read through this thread, found it very interesting as I love sexy outfits!
I'd love to see my girlfriend in a pretty red PVC cocktail dress (halterneck, full circle skirt, and a contrasting black PVC bow around her waist), with stockings, suspenders and some lovely thigh-high stiletto boots in shiny black PVC. Lots of red lippy, dark eyeshadow, mascara, the full works. She would look incredible! 
I'd also love to have her dress me in kinky girly clothes (as it stands I only dress in secret!) - PVC maids' outfit and thigh-high boots perhaps - and just let her tie, tease and use me. Would be heaven, if only she'd go for the crossdressing bit!!