I'm surprised that this hasn't been covered more by the trad blogs. Long ago, men's neck ties originated from the sashes and silk that noblemen wore into battle so why can't they be repurposed by tying them around the waist and used as belts today? I wasn't the first to think of this.
Back in school, many many years ago, I had a boarding school prep roommate who lived large in a lot of ways. He and his buddy from their Hunt Country highschool would daily consume MASSIVE amounts of Red, White and Blue beer, often while watching General Hospital in the afternoons. -You can't really blame them. That was during the time of Luke and Laura, afterall. He also had a bevy of very attractive girls (Meg and Cathy looked like stand-ins for Ally McGraw in Love Story) who loved his style; the Hickey Freeman jackets, the closet full of Brooks Brothers buttondowns, Elvis Costello albums, etc. As laid back as he was, his ex-military father was super straight-laced and formal.
With the exception of his choice of belt. He wore creased gray flannels with starched white buttondowns. Very conservative, but he used thin repp ties as belts. He literally tied them like one would around the neck but at the waist and it looked pretty freaking cool.