Hulu’s “The Handmaid’s Tale” first introduced the Plums into its dystopian world in Season 5. When Luke (O-T Fagbenle) and June (Elisabeth Moss) search for their daughter Hannah, they first learn about the premarital training school. Hannah is now older and named Agnes (Chase Infiniti) and attends Aunt Lydia’s (Ann Dowd) elite prep school, where she and other young girls are trained to become future wives. The young girls are grouped and defined by the color of their garments — “The Plums” are on the verge of womanhood, while “The Pearls” are outsiders who have enrolled in the academy. Costume designer Leslie Kavanagh, who had worked on “The Handmaid’s Tale,” was excited to shift from the red visuals to plum and tell a new visual story through costume. Here she breaks down the looks of Gilead and how she found the right shade of plum, and used military-like wool for Aunt Lydia (Ann Dowd). The Plums Popular on Variety Disney The Plums are daughters of Gilead.…