I've only got either Minkee or Cotton Knit outers on my WN NN's and we get on great with them as i find the outer doesn't really touch her legs just the elastic bit of the inner iyswim (all the inners are Minkee though
) I've got loads of Cotton outer NL's and i dont have a problem them either but then they're not on as long as NN's are
I would say if your worried about sore legs then go for Minkee inner and Outer to be on the safe side