I have two sons, 10 and 11. I bought the child’s medium. It fits them great. I bought some garden gloves at a local store.

VIVO White Youth Sized Beekeeping Suit, Jacket, Pull Over, Smock with Veil (BEE-V105Y) https://www.amazon.com/dp/B07GWWBXNC/ref=cm_sw_r_cp_api_i_8PV0EbZ7GSPD8