I purchased these for my granddaughter and what an awesome decision to do so from The Childrens Place. They're durable and sustainable for your middle schooler !!
I order a size 5T for my daughter. She is tiny but has out grown 4T so I got the next size up. But the 5T is too big on her, even the waist band didn't help. So I am ordering a size 4T since now I know how big these shorts are. Material feels great and the belt is very cute.