Designing “Historically Accurate” Costumes for Fantasy: Game of Thrones Case Study

This video analyzing the accuracy (?) of the GoT costumes has been out for a while, but I keep going back to it. The creative decisions that keep the costumes consistent and avoid breaking the “willing suspension of disbelief” of the viewer are invisible to me until she points them out - and I am fascinated by it. (And I’ve never seen Game of Thrones nor read the book)