These shirts are marketed as unisex, but I think they're more suited to boys: they're roomier and have longer sleeves than girls' shirts of the same size. They are good quality, soft and comfortable.
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Soft Brushed Fleece Crewneck Sweatshirt for π Boys and Girls 4-12 Years - Kid Nation Kids
42 Review
Star Wars, Marvel, and Disney Short-Sleeve T-Shirts for Boys from Amazon Essentials
50 Review
Boys 3D Graphic Hawaiian Aloha Short Sleeve Dress Shirt Tops with Button Down - Sizes 2-8 Years by Uideazone
47 Review
HILEELANG Boys Long Sleeve Tops Tees Shirts Graphic Cotton Casual Crewneck T-Shirts Sets 3 Packs" -> "HILEELANG Boys Graphic Long Sleeve Cotton Tops Tees Shirts, 3-Pack Casual Crewneck T-Shirts Sets
41 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 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