POPSUGAR Fashion Sienna Miller Sheath Definition: Sheath by Fashion 7/16/07 0 Shares Like us on Facebook Sign up for our daily newsletter > Follow us on Pinterest 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 You Won't Believe These 28 Stars Were Once Abercrombie Models It's Girls' Night Out at the Harper's Bazaar Women of the Year Awards Sienna Miller Can't Stop Wearing Slip Dresses on Her Press Tour Burnt Gets a Lot of Things Right About Restaurant Life — but a Few Things Very Wrong 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 Beauty Tips Fashion and Beauty News Celebrity Style Street 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!