My son is 6 years old. I don't think these shorts are good enough to wear out - they're just a cut above t-shirt material. However, they are ideal for sleeping and relaxing. The primary colors go well with all the random shirts my son seems to be getting, so he still looks put together (yes, I'm that mom. No shame). I can't imagine my daughter wearing these shorts although the legs are long in the style you would expect from boys shorts.
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review