What, on earth...

I saw an interesting man on the metro today.
He wore birkenstocks with heel straps
over thick white socks, grey at the toe and heel.
Khaki pants, just barely too tight,
wrapped around his thighs,
and his khaki sportcoat didn't match.
A tiny red lapel pin looked plastic and out of place,
ugly professional decor.
Under the slightly patterned coat,
he wore a faded black tshirt
where most of us would've put a collar.
Bird silhouettes flew across the tshirt's chest
over yellow and black squares.
He had grown a full salt and pepper beard
connected to his swept back, Chevy Chase haircut.
And as he walked away,
he rolled a suitcase with a smaller bag perched on top.

Who is this man
and what, on earth, is he doing today?

At first sight, I used a bandaid
to keep the place in my book
while I stared.