Four-year-old Leah loved being a pirate for Halloween. She never considered being a princess or a fairy. But once Halloween has come and gone, Leah misses so many things about her costume. She misses her sword. She misses saying "Arrrr!" But most of all, she misses her silly moustache. But Leah knows that it doesn't have to be Halloween to play dress up. She can wear a moustache whenever she wants! She can wear one while she's watching a movie, or riding her bike, or playing her favorite game. And when Leah's birthday finally arrives, she knows exactly what she wants to do: have a party where everyone must wear a moustache! At Leah's moustache party, everyone gets in on the dress-up fun, even Grandma!