Vuori biker shorts, the size tag has been removed but the waist is 13” laid flat, and they are very stretchy. I am typically a shmedium (or 6/8 in Lulu) when it comes to biker shorts/ leggings and these fit me very comfortably. Size medium is my best guess. Gently used condition- only very minor signs of washwear, but no holes, stains etc…