Double-Duty: How to Transition Summer Pieces into Fall

Don't pack away your summer pieces just yet! With just a few simple styling tricks you can take your favorite warm-weather basics into fall (or from casual to office-friendly...or day to night!) just like Blake Lively, Alexa Chung, Brooklyn Decker and more.

Sometimes making a seasonal transition is as simple as extending your sleeve length. Miranda Kerr wore her two-tone A.L.C. trousers with an arm-baring top, while Blake Lively styled her Lanvin pair with a long-sleeved shirt.

That perfect strapless red dress can span the seasons with addition of a clever cover-up. Charlize Theron wore her Lanvin peplum design sans topper, while Brooklyn Decker warmed up her Katie Ermilio wrap dress with the addition of a blazer and close-toed shoes.

It doesn't get easier than this! Make a classic pair of black shorts winter-ready with the addition of opaque tights. Ginnifer Goodwin and Alexa Chung wore nearly identical outfits, with the exception of Chung's warmth-adding hosiery.

Bright pants aren't solely for sunshine-filled days. Sure, Beyonce looked fab in hot pink Vionnet trousers and a matching print top, but Rachel Bilson made her lightweight Isabel Marant pair cold weather-friendly with the addition of black and white separates, including a boyfriend blazer.

Leather skinnies are chic year-round. Rosie Huntington-Whiteley styled her Elizabeth and James trousers for hot temps with an embellished tee and a bright bag. Just layer on a sweater (…and a cardi and a vest) like Olivia Palermo (in Daryl K) for a chill-resistant combo.

A sleeveless jumpsuit a la Gwyneth Paltrow's tuxedo-inspired Boy. By Band of Outsiders is one-step summer dressing, but requires a little something extra for fall. Follow Kristen Bell's lead and add a sparkling sequin jacket that echoes the low-dipping neckline.

A goes-with-everything jean skirt is not just for summery strolls. Kirsten Dunst may have worn hers for walking, but It Brit Poppy Delevigne took a similar style to a Chanel show with the addition of a silky blouse.