I'd love to fuck a WG whilst she's still wearing cute knickers, pulled to one side to allow me in but I gather this can be uncomfortable for women so I've never asked for it. The split-crotch knickers sounds like a good idea - I should ask 'em to wear those!
I like a girl to be in lingerie or sexy clothes when we meet, rather than naked. I want to watch her peel everything off.
During sex I don't like a girl to wear stockings and suspenders as I really like to feel naked legs against me, wrapped around my back, up on my shoulders, etc. I like it sometimes when WGs where those ridiculous high-heels like they wear in porno movies - you know, like the platform ones that are mostly clear plastic. That can turn me on a bit as it feels dirty for some reason. I'm also quite into uniforms - schoolgirl, nurse, cheerleader, etc, but never asked a WG to wear such an outfit for me (yet).