^ This outfit is so incredibly ballsy
/\ he's walking out of the good old Saarinen-designed Co-Op ...
to his right see the guy in khakis and plaid shirt clutching a load of books under his arm ... I never had a book bag or backpack in college, no reason, just dumb .....
I dress like that guy in the summer. But I have Sid Mashburn tan loafers or tan Rainbow flip-flops.
/\ what about Sunspel?
Aren't there several American brands doing it now?
Sid Mashburn makes a self-fabric collar. I've had them and not too far from what you posted, but it is pique so collars are thicker. But looked nice.
I had an Izod button-down polo (self fabric) which was excellent. Never seen them in stores in the US though.
More late 70's - 80's vibe (Seve)
https://www.criquetshirts.com/men/the-players-shirt?offset=0&limit=30
You might find some luck here:
https://www.gentlemansgazette.com/polo-shirt-guide/#buy
Here's another that's closer to what you posted, Berkeley. If you can manage Alibaba orders...
https://www.alibaba.com/product-detail/Mens-navy-blue-self-fabric-collar_1287562258.html
Navy and Slate Grey are my best colours for polos. I like Lacoste for fit and longevity.
/\ got to be raw slubbed India silk from J. Press