I never thought we would reach the point where we are be slut shaming a 7-9 year old girl in a Pokemon Movie, but here we are

How else would her loose-fitting stockings stay on without any elastic, then?

Believe it or not stockings used to be worn by children (both girls and boys) and were fastened to these robust-looking harnesses and vest-like garter belts. I guess since kids move a lot they needed to be extra sturdy.

Nowadays, these would be impractical to use with children but you only see them as inappropriate because the pornographic industry rebranded these formerly commonplace items as fetish gear.