Vents: ok first what is a vent? Slightly dramatically named, these are the small slits in the back of your suit jacket. Most suits come in single (one slit) or double (two slits), or if you’re getting a tuxedo, no vent. Try a double vent for a more contemporary look and a single for a more classic style. Any questions? our Bespoke Advisers are working around the clock for your guidance.