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Haley Reinhart and Lauren Alaina are the only two remaining women contestants on American Idol, and they worked their feminine charm with their style during last night’s top 7 episode! We caught up with the show’s costume designer Soyon An for the inside scoop. “Haley, with her tiny frame, looked chic with a ‘50s pin-up inspired dress,” An told InStyle of Reinhart’s red polka dotted frock by Stop Staring ($114 at StopStaring.com). “The tailored look made the dress look sexy and sweet on Haley.” As for Alaina, An gave the contestant the country look she loves. “I wanted Lauren to look young and fun and bring back her sweet country self this week,” An said of the outfit, which consisted of a Guess jacket, Marciano top, Wet Seal skirt and accessories, and Boot Star boots.

Click through for more details about their outfits—and find out what booted-off contestant Pia Toscano wore for her return!

MORE: All American Idol Style News!

Only two ladies remain in the running to become the next American Idol, and they both stepped it up a notch during the Top 8 episode last night! That’s why we scored the inside scoop about their style from the show’s costume designer Soyon An. Haley Reinhart slipped on a colorful dress by Single to sing her version of Blondie’s “Call Me.” “It was so chic and colorful and worked well with her performance,” An said of the frock, which she accessorized with purple thigh-high boots by Chinese Laundry. Meanwhile, An described Lauren Alaina‘s look for her performance of “The Climb” by Miley Cyrus as “sweet young rocker girl.” “The dress flattered Lauren’s figure and the animal print was fun!” She wore a dress from by Beyond by Jovani (style B199; $215 at TheMintCollection.com) and accessories from Bebe and Wet Seal. “Her boots are her own but I added black Swarovski crystals,” An noted of the extra touch. Do you think one of these women will emerge as the leader after last night?

MORE: All American Idol Style News!

What a rollercoaster week it’s been for the American Idol cast—no one got sent home! And they got down with Motown! The show keeps surprising us, which is why we caught up with American Idol costume designer Soyon An (inset) to get the inside scoop on the looks the lady finalists wore on this week’s episode. From Pia’s classic black silhouette to Thia’s babydoll party dress to Naima’s wild belly-baring look, to one of the girls’ secret cowboy boots, find out all the details about the clothes straight from the costume designer herself in the gallery.

PLUS! All American Idol Style News!