Yeah, japple's definitely right. One of my best friends is this huge, badass tattooed guy and he's always wearing those shiny-ass jeans. Especially nowadays, gender-specific clothing is getting to be a smaller and smaller group. The only thing I'd really say avoid is skirts and swishy fabric. And heels, obviously. Unless you want to crossdress and then damnit, go for it. My absolute best friend wears girl jeans all the time and half the time people don't even notice.
Personally, I'm more comfortable in girl's jeans because they fit me a bit better and they've got stretch to them, and no one's noticed yet.