I know Marei 1998 that offers eco faux fur coats, they are timeless so it's a great investment.
There is also Maison Atia, I read that they wanted to create both accessible and green items with this material.
They have amazing reversible coats, Gigi Hadid wear one of their pieces!
Eco-friendly but will do faux fur
Veredus has switched to a faux sheepskin in all its boots now.
Kentucky horseware uses artificial leather and artificial sheepskin. Ps of sweden uses eco-friendly.