When I crossplay, I have some men's deodorant I wear. The scent isn't overpowering, but it's definitely male. I don't know if it helps with the passing or adds to the character for others, but for me it gives me a little reminder that I'm a guy right now.
Currently working on: Silent Bob, Kaylee Frye, Junpei, The Doctor (Kimono), The Doctor ("The Christmas Invasion"), Doctor Who Fangirl, Star Trek Fangirl
2017 Conventions: Animarathon, Marcon, DragonCon