to be completely and totally honest, i don't think i'd notice if i didn't hear his voice.
the vest would cover everything up, as would the mask.
sex change junk doesn't change eyelashes or other facial features out of the very few we can see on him.
he'd only walk differently from a different center of balance, assuming that an operation would change body proportions (which they actually don't).
his voice would be the only giveaway.
i'd probably never go to fanfiction.net ever again, though; imagine the kakairu fic insanity... mpreg crazies would be set loose... D: