I've been looking around WR and the internet for a translation to this idiom but I can't find one anywhere. The basic idea is that you use this idiom to express the idea that someone should relax, or not get so worked up about something. For example, you're using the bathroom, and your brother is pounding at the door. You could say "I'm almost done!!! Don't get your panties in knot/bunch/twist!!!" Any natives out there with a similar French expression? Thanks!