POPSUGAR Fashion Sienna Miller Sheath Definition: Sheath by Fashion 7/16/07 0 Shares Like us on Facebook Sign up for our daily newsletter > Sheath n. Simple, straight dress, somewhat fitted at waist using vertical darts. No belt or waistband. Usually mid-calf or shorter. Works well in sleeveless styles on well-toned bodies, case in point: Mademoiselle Sienna Miller. Source Read More SheathStyle GlossarySienna Miller Sienna Miller 14 Style Icons Who Make Jeans and a White Tee All Their Own Bradley Cooper Will Make You Say "Yes, Chef" in the Trailer For Burnt The Craziest, Most Brilliant Dresses Alexander Wang Designed For Balenciaga Proof That Sienna Miller's Bohemian Style Is All Grown Up POPSUGAR, the #1 independent media and technology company for women. Where more than 75 million women go for original, inspirational content that feeds their passions and interests. Stay Stylish With OurFashion and Beauty Newsletter Personalize Street Style Fashion and Beauty News Beauty Tips Celebrity Style Sign up with facebook or By signing up, I agree to the Terms and to receive emails from POPSUGAR. QueenMargot 8 years I like the dress, but it doesn't fit good on her. kayden 8 years This is a nice black dress but, you must have the body shape for a dress like this. If your a hippy person this dress may not be best for you to wear. kayden 8 years This is a nice black dress but, you must have the body shape for a dress like this.If your a hippy person this dress may not be best for you to wear. cyrizzle 8 years i don't think it's that flattering on her. makes her look a bit pudgy in the middle... prosecco-in-the-park 8 years I'm not a big fan on sheath dresses, I feel like they make me look lumpy because of my chest =(. But I love Sienna!