Project Runway winner Christian Siriano designed several of the Emmy dresses that ended up on best dressed lists this year, and the designer invited ET into his studio.
Siriano was the mind behind Sarah Hyland's highly praised long coral number.
"We wanted it to be really young and cool and fresh," said Siriano. His one note from the Modern Family star was that she wanted to wear orange in some way. "Obviously Sarah kind of plays with fashion," Siriano continued. "She'll wear different things."
In addition to Hyland, Siriano also designed a sexy, strapless red gown for Orange Is the New Black star Uzo Aduba.
"Orange is the new black, but red felt right tonight," Aduba told Rob on the red carpet.
"I thought red would be a little more shocking even though everybody wore red in the end," Siriano said.
Stars such as Julia Louis-Dreyfus, Heidi Klum, Christina Hendricks, January Jones and more all went rouge for the occassion.
Watch the video to find out Siriano's reaction to Lena Dunham's daring outfit.