I know it says one size fits all, so I was weary, but it ended up working out great. I was a plus size 22 US shirt/pant (I've lost weight and two US sizes since then already from pandemic home work outs, go me!), and it fit me very well actually. I had room to move around and sit comfortably just like regular pajamas. I got lots of compliments on it, especially on the detail of the hood of the lobster, and the little legs that come off the sides my one friend really likes. It's really, really cute, and definitely the best quality made animal onsie out of the ones I own for sure! Thank you, I want mooore now