These are HUUUUGE.  I have a 2.5 year old son who wears size 2T pants.  He weighs 28 lbs and based on the size chart he needed the size 2T in these plastic pants.  They are so big that my almost 8 year old (skinny) daughter can fit in them and a 4-5 year old child would fit in them easily.  And... you can't return them.  So now I'm stuck with them.  Maybe they can be used in some sort of Halloween costume or worn as a crazy hat or something.