I purchased this for my daughter--she loves Elmo.  She is 17 months old and wears 18-24 month and some 2T clothing with the later generally being too big for now.  I was surprised when I put the pants on her and they were a little tough to get passed her thighs.  She isn't fat (65% for height and weight) but the pants "just fit".  (They actually fit her the way some 18 month pants fit her). Also, after wearing them for a few hours, one of the belt loops detached.  The top is adorable and fits her the way I expect a 2T to fit her--slightly longer and I have to cuff the sleeves.  It's a really cute outfit, I just wish the pants were bigger now so she can continue to wear them for the rest of the season.