I try to dress like a "real" woman my age (or a few years younger but that's still "old"). Of course I can't pull off some of the things they wear because I have a male body and some body hair. I have to conceal as much skin as possible.
What I don't do is dress like a hooker. No six inch heels, no short miniskirts, no overdone makeup, etc. I think that's the mistake many crossdressers make.
