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Mary-Kate and Ashley Olsen asked Brad Goreski to be the guest stylist for their October Stylemint collection of easy-to-wear comfy tees, and we’ve got an exclusive video of him styling his favorite piece! The celebrity stylist—who once confessed his Olsen obsession on The Rachel Zoe Project—picked the black and white striped long-sleeve Lenox tee ($30, stylemint.com). “Using T-shirts in styling for me, it’s the go-to,” says Goreski. “It’s something that everyone feels comfortable in, but there are so many different ways you can do it, so many different ways you can dress it up.” Watch the video above for more styling tips, then head over to stylemint.com to shop it now.

BONUS FOR INSTYLE READERS: Get 20% off your entire purchase when you type in “instyle20” at checkout. Offer valid through October 31, 2011.