They fit snugly. I would suggest increasing the size. This is my favorite for my son who doesn't wear anything soft. We love fun colorful prints. This is the only brand he will wear.
πͺ 3T Boys Training Underwear: Comfortable and Durable Toddler Underwear
41 Review
Comfortable & Practical City Threads Underwear: Sensitive-Friendly Boys' Clothing
47 Review
π Brix Boys Long Sleeve Tees - Optimized Clothing for Boys
42 Review
Comfortable & Durable: Lucky & Me Noah π©² Boys Boxer Shorts 5 Pack - 100% Cotton Tagless Underwear
49 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review