Size up because it will shrink with the first wash. I planned for it so it wasn’t a problem for me. I always size up in non pre shrunk cotton. I bought the 10/12 for my size 7/8 daughter and it probably shrunk to a 6/7 size.
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review
Eocom Pairs Childrens Winter Animal Girls' Clothing
64 Review