Yes, men's suit overcoats can be easily worn without a suit if you style it right. Unlike what many people think, an overcoat is not just an extension of a suit. A long suit coat can easily add smartness to your attire without the need for a suit. However, the overcoat must be perfectly tailored and make you look great. You can pair your men's suit overcoat with a shirt, washed-out jeans, and boots for a casual look. For a night out, team up a men's long double-breasted overcoat with a knitted jumper and ripped jeans.