Jack & Jones Mens Slim Fit Jeans Denim Pants Casual Trousers for Men UK, 27W to 40W The perfect mix of style and comfort is offered by these men's slim-fit jeans from Jack & Jones. They are made out of top-notch denim and are cut in a slim, modern style that works with absolutely any outfit. Quite versatile in their appeal, these trousers can be combined with t-shirts, jackets, or even shirts for common semi-casual and casual occasions.