By Sharon Clott Kanter
Updated Jun 11, 2012 @ 8:00 am
Credit:; Time Inc.Digital Studio; Courtesy of Trina Turk for Banana Republic; Courtesy of Solstice Eyewear

Are you the best dressed InStyle reader? Show us! Yesterday, we told you all about our new partnership with InstaDerby—a site that turns Instagram photos into a global photo competition (the horse is the mascot)—and today the polls are open! Here’s how it works: Every week, InstaDerby posts a theme and you have to submit a photo inspired by that theme. This week’s inspiration? InStyle! To get your photo in the running, Instagram a picture of your outfit and add the hashtags #instaderby and #InStyle to your caption. Then head over to starting today to vote for your favorite looks. The photo with the most votes will win an amazing beach bag full of our favorite items from Banana Republic, Victoria’s Secret, and more. Plus, the winner might even appear in a future issue of InStyle magazine! So, start Instagramming your photos now, and make sure to share your photos with friends on Twitter and Facebook—the more votes, the better. InstaDerby will announce the winner Monday, June 18th. Good luck!

Plus, see InStyle's Instagram photos!