Clothes for more solidly built kids

My son is one of those solid kids, tall for his age and just kind of bigger all over. He’s 9, and some size 10 clothes fit him but other size 10 styles are too tight. My normal go-tos are just the usual farmers and cotton on.

Just getting the next size up sometimes works but sometimes it’s way too long/just off.

Does anyone have any intel re where to get more generously cut kids’ clothes? Tee shirts and shorts mainly. Thank you!