The casual boot is a workhorse, the laced-up, ankle-high handsome staple in your casual wardrobe. A perfect casual boot has a rugged, worn-in look that says they don't mess around and they get the work done.Casual boots lend themselves perfectly to casual outfits, so wear them with jeans, chinos and wool trousers. However, the casual boot is also a great footwear choice if you want to spice up a formal suited look.