Cosplay-related Question

[firebird-88.livejournal.com]

This is a long shot but... to anyone that has had experience cosplaying C.C. (or cosplaying in general) what would you use to draw the red Geass on her forehead? I need something that can wash out by the next day (so not Sharpie, sadly) but will stay on and (hopefully) won't be smeared by bangs or sweat during the day.

Any suggestions? ^^;;;;