For women it's the best way to cover up your legs instead of wearing tights or adopting that long-fitting top into a skimpy dress. They've fast become a fashion staple for most women and an excellent alternative for jeans.
However, the lads just don't see it. All they see is all girls' lumps and bumps laid bare, with girls wearing them no matter what their size or shape leading to many a sausage leg on the dancefloor.
At best they take out all the mystery as the lady's contours are revealed for all to see.