Pineapple set

Tank top and panties with sparkly pineapples on top and all over matching panties tried the top on it's a medium but fits like a small! I DID NOT TRY ON THE PANTIES since the top didn't fit I assumed neither would the bottoms should have gotten large! Can't return them got them at the beach a few weeks ago and just unpacked, no receipt... again TOP FITS LIKE A SMALL