Here's what I'm envisioning: the possibly inebriated rider pulls up in the biker bar parking lot and, eager to join his buddies inside, hops off without disconnecting, instantly and uselessly inflating his jacket and earning much laughter from pals.
Raymond Duncan, brother of dancer Isadora Duncan, practiced a unique fashion philosophy. He spurned conventional attire and always wore a toga, from 1905 until his death in 1966. He said the toga allowed the body freer movement (though it must have been a bit drafty in cold weather, especially since he was living mostly in Paris, not somewhere warmer). And it also had something to do with embracing the "rhythmic harmony" of Ancient Greek civilization. More info here and here.