Siwy Jackie Slim Straight Jean. - size 28 (also in ) Siwy Jackie Slim Straight Jean. - size 28 (also in ) 98% cotton 2% elastane. Slight fading along front. Frayed raw cut hem. 12 at the knee and 12 at the leg opening. SIWY-WJ520. W323CRK4 BYT. Launched in Spring 2005 in downtown New York City, Siwy offers the ultimate denim collection: vintage-inspired, sexy, fashion-forward designs with perfected finish, detail, and fit. Siwys superlative, modern tailoring creates the ultimate figure-flattering fit with unparalleled comfort. Siwy has become a favorite amongst style icons including Kate Moss, Sienna Miller, Nicole Richie, Selma Blair, and Rachel Bilson.