BWT: (Truly) ethical/sustainable sundress?

Hello bitches!

Every spring I get the itch to return to searching for my white whale: a colorful possible patterned, ideally mini length, sundress that I can wear a bra with. I wear a size 16/18 so I’m right in the zone where I mostly try to shop plus size- brands that just go up to xl generally do not work for me. I’m also hoping for a dress that is at least 90% linen or cotton, or a blend of the two.

Lastly, I’m hoping to only spend money on a brand with ethical and sustainable values- brands that have clear labor, sourcing, and manufacturing standards. My budget is $150, with some flexibility to go up to 200. Where are we finding dresses like these? I come up short every year.

Thank you all!