Even the lingerie doesn't really give it away. It could be a (and I'm only using these two terms here for arguments sake) man pretending to be a woman.  Not that there is anything wrong with that when people do it, if anyone here is into that, go get your kink on! But fats, I mean they see their tits but they can't see or reach  their crotch to see what's hiding down there so it's not unfathomable that once in in a while some of them would simply forget what they were born as.