My daughter is a petite 10 year old who usually wears a Medium in Gap/ON. Last year she started wearing a scoliosis brace full-time and it's been hard to find clothing to fit over her brace easily but not be ridiculously (or uncomfortably) big everywhere else. Gap rompers with this style of neck h...ave been a LIFESAVER. I can size up to the Large so there's room for the brace, with the neckline elastic keeping it from looking too big through the shoulder. The super-stretchy neckline also makes it easy for my daughter to dress and undress (which can be a challenge with the stiffness of the brace). It's also a great length, not too short, and my daughter especially loves the pockets. Plus, the way it fits (a little fitted through the hip, blousing out above the waist), you can't even tell she is wearing a brace. She's not particularly self-conscious about it, but she likes having these cute, stylish outfits she doesn't have to worry about fitting properly. I loved the Softspun pants version of these for the spring, and these cotton ones are perfect for the summertime. I have to buy extra because she wears them as pajamas too.