Minimalist Older Boys Clothes (size 8+)

My son is exiting the size range for many of the brands we've been buying from: Go Gently Nation, Colored Organics, Mini Mioche, etc. He's also somewhat aging out of the style. Some of my favorite styles (like Go Gentlys placket top) for my young son just don't suit now that he's older. Ethically produced is also a core value for us.

Here's what I am looking for:

-Boys sizes 8-12 available

-Clean and simple basics that aren't overly kidsy. Chinos, basic shorts, button ups!

-I am not into graphic tees or cutesy clothes.

-Ethically produced in sustainable fabrics (organic cotton etc).

-Ships to the US

My son's wardrobe is a point of delight for me and we are the eldest in a long line of younger children who have worn his hand me downs to well loved shreds, so I don't mind spendier pieces if I am paying for sustainability and ethical production.

Any brand recommendations or ideas of where to look?