Got these for my almost 5 year old daughter in XS. They're a perfect fit as of now, I specifically did not purchase a size that she could "grow into" as most of the cold weather items she has are too big for that reason. They fit slimmer than most sweatpants for kids, which is what we wanted. The waistband is thick and sturdy and sits flat- no uncomfortable rolling up. She loves the cheetah print!