I can only speak for the Lalafell, but the running animation causes very noticeable clipping issues with dresses and skirts (Such as the Spring and Crescent sets).

This gif is with 'Full' movement physics, however it also happens with 'Simple'. Less so with 'Off'.


It seems the simplest thing would be to have the back of the dress go just a bit higher above the foot and we'd be all good; that is unless they're going to put Lalafell in heels anytime soon.