Party-in-the-U.S.A. pants and star-spangled short-shorts dominated the dance floor as "Dancing With the Stars" gave its ballroom salute to Patriot's Day.

While the red, white and blue frocks were a requisite, the show's Emmy-winning costume designer, Randall Christensen, also tapped into distinctly Americana themes. His creations paid homage to Fred Astaire and Ginger Rogers, Las Vegas divas, cowboys and good ole' Uncle Sam. "What I create is always about the music. Once I heard the playlist I knew red, white and blue was not going to be the only norm," he tells StyleList.

Here we pay tribute to some of the best looks of the night:

"Dancing With the Stars" contestants Chelsea Kane and Kirstie Alley. Photo: Adam Taylor, ABC

Chelsea Kane: This season's girl-to-beat turned up the heat in a pair of fringed red-and-white striped pants topped with a midriff-baring star-spangled tank. To create the kinetic pants,which punctuated every thrust of Kane's hips, Christensen's team cut individual strips of fabric, adhering them to the base pattern one-by-one. "Just attaching the fringe took hours upon hours," Christensen says.

Kirstie Alley: Wore royal blue palooza pants and a tattered peasant top which featured a sheer, bedazzled midriff to boogie to Lenny Kravitz's "American Woman." Alley danced under the tutelage of stand-in dance coach, John Travolta. The actor encouraged his friend to ditch the Manolo Blahnik heels she slipped out of last week for a pair of high-top sneakers, but Christensen gave her classic court shoes instead. "Pumps were appropriate for the song's era," he explains, Custom rhinestone buckles were added to authenticate the look.

Meanwhile, the design team barely had enough time to make Maksim Chmerkovskiy's custom skin-tight leather pants, which he wore shirtless. The pants were a special request by Alley.

"Dancing With the Stars" contestants Petra Nemcova and Kendra Wilkinson. Photo: Adam Taylor, ABC

Petra Nemcova: The supermodel's back-baring gold gown was inspired by the glamorous Las Vegas look of Marilyn Monroe crossed with Sharon Stone in "Casino," Christensen says. "We had originally discussed a more Vegas showgirl look, but once the choreography was in place it was obvious the look of a more classic couple in formal wear was the way to go. And what's more glamorous than Marilyn and Sharon?" he says. Nemcova helped design her elbow-length gloves cinched with silver-crystal jewelry while her lush ostrich boa became a feathery stole.

Romeo

"Dancing With the Stars" contestant Romeo. Photo: Adam Taylor, ABC

Kendra Wilkinson: Christensen used stretch blue satin to create her sleeveless tails and encrusted her vest in silver-studded stars. An inventive addition to her costume: Over-the-knee tights made to resemble boots. Their flexible fabric made dancing easier and Christensen added crystals for sparkle. "I think the look empowered her and gave her confidence," he says.

Romeo: The rapper's refined tuxedo and tails salute to Fred Astaire, and partner Chelsie Hightower's sublime Ginger Rogers' inspired off-white bias cut gown was StyleList's favorite look of the night.

For more "Dancing With the Stars" scoop, read last week's recap which includes details on Alley's designer shoe mishap.