I know this isn't entirely on topic but I hope it's with the theme.
There's a video of a girl demonstrating her impressive Nauli skills on Youtube.
She's wearing a top and a sash tied around her waist.
To do the Nauli she has to drop forward quickly then arch her back.
Several times you get a split second glimpse that suggests she's not wearing anything under that sash.
3 times it's perfectly clear, for a split second, that she's not wearing anything under that sash
0 min 18 secs
1 min 21 secs
6 min 22 secs
somesite/watch?v=09uVsZL0M7c
replace somesite with youtube.com (link broken to reduce flooding of that video)