She slips

Her socks don't give her much traction on the floor as she tugs on the curtain and that proves to be her undoing.

Her feet slip out from under her and the entire curtain rail collapses down, with a little help from you landing behind her and not actually covering up her nudity at all. Not only that, but the sides of the changing room wobble for a moment before beginning to topple into the dressing room beside it, the entire unit falling to the floor and forcing another woman to leap from her own dressing room in nothing but a green bra and panties set.

Hanna lays there in shock, slowly realising that she's still completely exposed to the cameras as the new woman looks around, covering herself up and screaming at the collapsing wood, which has drawn even more attention towards the pair of them.