Allison Williams's Red Carpet Style

It took more than 500 hours to craft this crimson Armani Privé dress, which featured thousands of Swarovski crystals—and weighed a whopping 45 pounds.

“Sometimes it takes three weeks to get the right fit on a couture dress, but this needed no alterations,” stylist Cristina Ehrlich says of the silk tulle Giambattista Valli Haute Couture ball gown the star wore to the Emmys. “If it’s possible to have a crush on an article of clothing, it happened,” Williams posted on Instagram.

Williams, a Yale graduate, “is aware of what fashion can do for a woman,” says her stylist. “This feathered Alexander McQueen gown is a quiet storm—chic but not overpowering.”

“I was lucky to know Oscar de la Renta before he passed,” says Williams, who wore his custom silk faille gown to the Met Gala, along with a 27-carat diamond necklace by Fred Leighton.

Williams arrived at the 2013 MTV Video Music Awards in a long-sleeve Valentino frock with an illusion neckline. Christian Louboutin pointy-toe pumps and Paige Novick earrings completed the look.

The actress chose head-to-toe Chloe for The Hollywood Reporter’s Emmy Nominees Night in Los Angeles.
 

With its clean shape and delicate workmanship, this Valentino gown has an Old Hollywood feel that inspires the star. “I ask myself, ‘What would Grace Kelly wear?’ ” Williams has said.

Talk about drama! For her walk on the red carpet at the Metropolitan Museum of Art's Met Gala, Williams chose a sexy black lace Altuzarra gown with sheer peek-a-boo panels.

For the Season 3 premiere of HBO's 'Girls,' Williams worked a baby-blue embellished minidress by Christian Dior.

“Allison loves model Karlie Kloss. When we saw this cobalt gown Kloss wore in the Ralph Lauren Collection show, we knew it was Allison’s dress for the Emmys,” says Ehrlich.

“From the delicate lace sleeves to the layered tulle skirt, this Oscar de la Renta design is poetic,” says Ehrlich of Williams at the Winter Ball for Autism. “Oscar was always one of Allison’s dream designers.”

Another Oscar de la Renta number paired delightfully with pink metallic Jimmy Choo pumps at the BAFTA L.A. TV Tea Party.

In a minimal leather-and-cashmere shift, Williams “exudes an all-American elegance,” says Calvin Klein Collection’s Francisco Costa.

Williams stunned in this Alexander McQueen halter column at the UK premiere of 'Girls' Season 3.

“Allison literally shined,” says Monique Lhuillier, who designed the crystal-adorned dress the actress wore to the Season 4 premiere of 'Girls.' “She carries herself with such poise.”

The actress sat front row at Michael Kors's Fall 2015 show in a daffodil- and peony-embroidered matching set by the designer.