Citizens of Humanity Isabel Rib Tank in White. - size XS (also in L) Citizens of Humanity Isabel Rib Tank in White. - size XS (also in L) 49% organic cotton 49% tencel lyocell 2% spandex. Made in USA. Machine wash. Ribbed jersey fabric. CITI-WS126. 9201-3004. Established in 2003, Citizens of Humanity is renowned in the fashion industry for its pioneering approach to premium denim. With an uncompromising focus on fit, fabric and wash. Citizens of Humanity jeans are the ultimate luxury denim.