Armor and clothing in movies and shows with historical settings. I really appreciate when they get the details right and it can be really jarring when it's bad. The Northman is a good example of what vikings probably dressed like, which is basically the same as how all medieval people dressed. Simple wool and linen tunics and big cloaks fastened with broaches. No fur capes or leather armbands or cornrows, looking at you Vikings on the "history" channel.