Ensure It Is Not Long And Can Fit Well In Your Boots. Next slip the knife into one of your boots, with the handle sticking out. Step by step how to wear a boot knife with cowboy boots 1. For men, slacks or dark wash jeans will instantly change the elegance of the outfit. You Want A Sheath That Will. Second, be aware of where the knife is located so. Slim and sleek, the biggest advantage of a boot knife lies within its super compact profile, it’s concealable weapon by all.