/cgl/ - Cosplay & EGL

Help me /cgl/ I'm too pure for this stuff

>Con with friends at final day
>cosplaying Kano
>one of my friend's friend join our group
>that girl is well know for being a bit pervert
>she's cosplaying some girl from HoTD
>ripped outfit with a huge torn on the the side of her skirt, but didn't paid much attention at the time
>at some time she sat close to me and talk usual stuff
>at other times she asked us to do her photoshoot with some lewd posing
>she was there the whole con walking with us
>I just minded my own bussines and my own fun
>Next day comes in and all girls on the group are discussing about the con
>Sudden the pervert girl's friend mention that this girl was pantyless the whole con for coplay reasons
>some other girl confirms that
>I'm in total shock
>I start to wonder why she did that, if anybody saw, if everytime she was climbing the stairs anything was visible, if her skirt lifter at some wrong time. I remind everytime she crouched or sat on my direction what I could have seen.
>my mind goes into a storm
>it's still is
>I'm still wondering how could she do that and act all normal on the day on such populated place

I can't take it /cgl/, this is too much for me, I'm too embarassed to talk about this to anyone but here