Review on BTween Fashion Stretch Leggings Comfortable Girls' Clothing by Krystal Barnes

How is it possible that 4 packs of girls' pants in size 12 have different sized elastics on the waistband? Black is too small, pink is too big. If they are all a size 12, then they should all be the same size. The label says 12 on each pair. Makes absolutely no sense. In addition, 2 pink are very transparent. She has to wear a long shirt because underneath everything will be visible.