We ordered a size 10 for my 7 year old son. He's a bit tall, so let's make his shirts bigger. However, the size 10 was too tight for him and we swapped it for a size 12 with no problem. Size 12 fits well (for now) and we can wear a different shirt underneath when he outgrows it. I would increase the size if your kid is not a green bean. However, if your child is small, they may be sensitive to the increased length that comes with larger size.
Soft Brushed Fleece Crewneck Sweatshirt for π Boys and Girls 4-12 Years - Kid Nation Kids
42 Review
The Good Day Lab Clean Shield: Ultimate Comfort and Breathability in Tagless 4-Way Stretch Polo
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Van Heusen Sleeve Dress Poplin
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Boys' Long-Sleeve Disney Star Wars Marvel T-Shirts by Spotted Zebra
46 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
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Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review
π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review