These white USISI SISTER Isabella high waist trousers have been crafted from a stretch cotton fabric and feature long flared legs with turned-up cuffs, side pockets, back pockets, a zip at the front to fasten and thick belt loops. Fashion test. What do Jane Birkin, Miranda Kerr, Alexa Chung, Johnny Borrell and yourself all have in common? You're all passionate pioneers of the perfect white trouser. We'll catch you in your USISI SISTER pants hanging round Hanover Square.