Hand on hip, staring provocatively at the camera, the heavily made-up ‘tween poses in her “Dark Angel” costume complete with lace bustier, fishnet tights and strappy high heels. Another ...

(And stop before you suggest making costumes or going down the rabbit hole that is Pinterest. I’m not THAT mom.) Although THAT mom probably doesn’t suffer the tween Halloween costume gap.

Other kids may have opted for store-bought tween costumes—like this Goldilocks tween super-miniskirt costume (with a choker?), left—but not Karp. Turns out the pre-teen costume market is ...