I have recently been watching one of my favourite movies, the original Parent Trap starring Hayley Mills and there’s a scene in that film which might be relevant here.
I have the recent DVD release which includes a commentary by now adult-Hayley talking about her memories of the film.
There is one scene early in the film when a group of girls cut away the back of Hayley’s skirt, exposing her knickers for all to see. In the commentary, Hayley reveals that she was extremely embarassed about the idea of this scene and so she wore multiple pairs of knickers over each other in a belief this would make things better.