This doesn't make me feel to good, but I was on omegle (an instant stranger to stranger webcam), and as a guy I had a few people ask me "m/f" whereas most people knew I was a male. That's cool.
Then I turn the lights, and place a sweater on my head and dangling like hair (dimmed the light so only my computer screen light was going on). I say 60% thought I was a woman, and one guy went "ewwww you're ugly.. ewwww!" when I was smiling.
So all it takes is dim lights and a sweater, I guess that's good?