PS By Paul Smith Trousers in Navy. These slightly tapered smart trousers are an essential piece for your smart wardrobe. The trousers hold a navy checked pattern with a hook and eye and zip fastening. Other features of these formal trousers are the belt loops, two back pockets and an un-hemmed finish so the trousers can be taken up to a length to suit you. Style with a smart shirt and brogues for a day in the office or a special occasion.