Nope. That's not his clothes that perhaps resembles a toga.
Nope. That's just some piece of cloth that just draped around him either.
Maybe it's his blanket when he sleeps on the streets at night.
If you go close enough, you can actually see the shlong and ding dongs.
I know coz I had the unfortunately luck to witness it up close when he was standing right next to our car at a red light two days later.
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p.s. If you are REALLY that curious, click on the picture to enlarge.