Kourtney Kardashian was spotted in Torn by Ronny Kobo's $238 blouse, which she paired with printed black and white pants and Celine's bight yellow Phantom handbag. Credit: IXOLA/AKM-GSI

In between seasons, long sleeves can go a long way -- but only if they billow! Boho babes Kourtney Kardashian, Molly Sims, Selma Blair and Camilla Belle are going with the flow in the '70s-inspired wardrobe staple.

Calling her personal style "eclectic," Kardashian, 34, was recently spotted in Torn by Ronny Kobo's $238 blouse, which she paired with printed black and white pants and Celine's bight yellow Phantom handbag.

As New York City-based stylist J. Logan Horne (who has worked with Chrissy Teigen) tells Us Weekly, the blouse is best worn with streamlined pants. "Tuck in the tops or wear them with skinny jeans to avoid looking like a flour child fiasco," says Horne.

To dress up a tunic -- like Belle did when wearing CH Carolina Herrera in June -- Horne suggests bold accessories, and the bigger the better. "Big hoop earrings are a must at night!" he tells Us.