Plunging Necklines

Sienna Miller

Sienna Miller in vintage Ossie Clark

Sara De Boer/Retna

Ali Larter

Ali Larter in Ports 1961

Stephen Shugerman/Getty

Mary-Kate Olsen

Jeff Kravitz/FilmMagic

Felicity Huffman

Felicity Huffman wearing Dina Bar-El

Michael Buckner/Getty

1 of 5

1 of 4 Sara De Boer/Retna

Sienna Miller

Sienna Miller in vintage Ossie Clark

2 of 4 Stephen Shugerman/Getty

Ali Larter in Ports 1961

3 of 4 Jeff Kravitz/FilmMagic

4 of 4 Michael Buckner/Getty

Felicity Huffman wearing Dina Bar-El