The latest behind-the-scenes featurette for Season 3 of Game of Thrones takes us North of the Wall to explore the Wildlings. Author George R.R. Martin explains that these characters are deemed "uncivilized" by those who live in the Seven Kingdoms of Westeros, and we also hear from cast members Rose Leslie (Ygritte), Kristofer Hivju (Tormund Giantsbane) and series creator D.B. Weiss, who expand on the Wildlings' mythology. Costume designer no_Michelle Clapton breaks down the different attire that is worn by Wildlings from distinct tribes, and production designer Gemma Jackson shows how practical these nomadic tribes really are, carrying only what they need from place to place. Take an expansive look at these intriguing characters before Season 3 debuts with "Valar Dohaeris" on Sunday, March 31 at 9 PM ET on HBO.