SAG Awards fashion 2015: Reese Witherspoon, Julia Roberts and more

Julianne Moore in Givenchy and Chopard jewelry

Reese Witherspoon in Armani and Harry Winston jewelry

Julia Roberts in Givenchy

Julianna Margulies in Giambattista Valli

Jennifer Aniston in vintage Galliano and Fred Leighton jewelry

Keira Knightley in Erdem

Emma Stone in Dior Couture

Sofia Vergara in Donna Karan Atelier (with fiance Joe Manganiello)

Felicity Jones in Balenciaga

Lupita Nyong'o in a colorful gown

Ethan Hawke in a gray-green tux and Patricia Arquette in an emerald gown

Naomi Watts in Balenciaga

Sarah Paulson and Amanda Peet (in J. Mendel)

Claire Danes in Marc Jacobs

Maggie Gyllenhaal in Thakoon

Emilia Clarke in Donna Karan Atelier and Cartier jewelry

Julia Louis-Dreyfus in Monique Lhuillier

Laverne Cox in Johanna Johnson and Danielle Brooks in Christian Siriano

Laura Carmichael

Viola Davis in Max Mara

Sophia Bush in an orange column

Sarah Hyland in Vera Wang

Natalie Dormer in Naeem Khan

Joanne Froggatt

Kevin Costner and Christine Baumgartner

Julie Bowen in an embroidered cream confection

Tatiana Maslany in Oscar de la Renta

Emmy Rossum in Armani Prive

Anna Chlumsky in an iridescent white and deep red gown