The material is thin and cheap and comes very wrinkled so be prepared to iron which I loathe doing.  This is not flattering for someone who has a problem mid section.  A belt and a cardigan can help balance an apple shape or a problem mid section.
It is comfortable and pajama like material.  It offers no support in contouring the body.  If you are plus size you should consider a high waist body slimmer pantie.  For reference I am 5.5, 200lbs, size 14/16W Plus Size.  I ordered the 2x and it is a bit loose but I think this type of jump suit I prefer the extra room but I have no doubt the 1x would have worked well too.