I'm 5ft3 160 lbs and I got a large. I should have gotten a medium. I had to take the pants in. The jackets a bit oversized but it's cute.

Love this suit. I usually purchase size 3X with most things at Fashion Nova. 5'10 280lbs. I ordered a 2X. it was a bit snug on me. But I thimk a 3X probably would be too big. I don't know. There is NO STRETCH. Pants zipper is in the back which I am not used to. I really thought it would have a front button and zipper. I am not usually a fan of so many flowers in a design. I really love this suit though. Tall girl friendly.