Jenna Lyons is the president and creative director for J. Crew. She’s also sort of a walking, talking embodiment of the brand’s hip preppy vibe. In this video, a clip from the upcoming CNBC documentary, “J. Crew and the Man Who Dressed America,” Jenna talks about how the company must predict what trends will be popular more than a year out. She and J. Crew CEO Mickey Drexler are largely credited with bringing the company back from the brink of failure, and “The Man Who Dressed America,” debuting May 24 chronicles the brand’s auspicious rise.