Revolve Clothing and YOOX are two of my favorite websites for finding ethical brands on sale (I've gotten some FANTASTIC discounts on these sites!) Be warned - NOT every brand on these sites, by any means, is ethically sourced.
As a side note, Black Milk is ethically MADE by a guy named James Lillis and his team - but the origin of his fabrics are unclear. Also, Jamie Ryan Dee of Spiked Apparel personally told me his line is sweat-shop free - but I have no way of verifying that!
YOOX is one of favorite websites for finding ethical brands on sale (I've gotten some FANTASTIC discounts here!) However, they do not sell ONLY ethically made items. Also, Jamie Ryan Dee of Spiked Apparel personally told me his line is sweat-shop free - but I have no way of verifying that!