Laid Back Kids Halo Lightweight Sweatpant

First time purchase, I wish I would have trusted my gut and gotten a medium in both the hoodie and the sweatpants. My son is a lean 10yo 56 inches (4’6) so from looking at the model photos I decided to get S. They are oversized, in how baggy the cut is, but the waist and length were too small. Gifted the small set to my 7yo nephew and will need to get the next size up for my son.