Good quality and very cute

Very cute and versatile romper however I’m 5’5 120 usually wears an xs but purchased a small to avoid seeing my mooseknuckle… how ever, the romper pulls around the bottom of my back and top of my butt area in a weird way so I’m returning for a medium hoping that it will have a better more comfortable fit to my body. Sleeves are long and I like long sleeves. Hopefully medium will be slightly longer.