Personalized Behind Muggles & Mom Youth Long Sleeve T-Shirt. Muggles and Mom westie terriers - A behind the scenes look from the making of children's book, "MUGGLES' NEW HOME" by Author & Illustrator, Kim Niles youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)