Successful men in many walks of life find themselves periodically in the spotlight. And men who care about the image preserved in their newspaper clippings or YouTube clips need to look their best on those occasions. In general, the best looks are the simplest.
Simplicity begins with the avoidance of distracting patterns. Pattern can appear to jump or vibrate on video. Men in the public eye should choose matte fabrics in solid colors, unless they're making a courtroom appearance during the 1930's like the man in the illustration. Video hadn't been invented yet you know.
Those matte fabrics should be impeccably pressed, as well. You probably can't steam away wrinkles before you're the center of attention, so make arrangements to change into wrinkle-free clothes.
It's also important to remember that reflection is the enemy of flattering visuals (RIchard Nixon may have lost the Presidency of the United States to John Kennedy by refusing make-up for a televised debate in 1960). Eschew the glare of white shirts during the day. When on camera or speaking from a podium, wear a leather wristwatch band instead of metal to avoid distracting flashes of light. Choose cufflinks that don't reflect. And forgo eyeglasses or replace them with contact lenses for the same reason.
Once properly attired it is a good idea to rehearse in front of a full length mirror. Rehearsal may seem awkward to the uninitiated but they should be assured that the actors they admire know exactly what to do to look their best on camera. Practice builds confidence that the details are under control, so it's easier to forget about appearance and focus on content.