In Age of Adaline—her first film since 2012's Savages—Blake Lively plays a woman who stops aging after a cataclysmic car accident. Adaline is a perennially fresh-faced 29-year-old, but her style evolves with each decade that passes, from the '20s into the present day. "The clothes in this movie are really used to support the story of Adaline," says costume designer Angus Strathie, an Oscar winner for Moulin Rouge. And Lively—whose love of clothing has made her a fashion favorite—was certainly up to the task of donning period clothing ranging from '50s-inspired sweater sets to '60s-style miniskirts. "I had a vision from the beginning of what I thought Adaline would look like through the decades," Lively says. Read on for Strathie and Lively's take on the title character's spectacular style.