Ok, a slightly different kind of ethical alternative today:
GFW is a small independent clothing maker who don't use sweatshops and don't classify people by gender.
They are having free shipping to anywhere in the world for the next two weeks, plus 10% off with the discount code "firstorder".
https://www.genderfreeworld.com
They use a sizing system which works by body shape, not gender:
https://www.genderfreeworld.com/pages/our-sizing
They cost more, but that's because they pay a proper wage (they manufacture in the UK).