I just love the collar on his shirt, buttoned down and goes right to the lapels on his jacket. Also points for the tie, very tastefully tied and with nice dimples.
From this article about how stylish he is https://www.bloomberg.com/news/newsletters/2025-11-08/zohran-mamdani-becomes-new-york-city-s-new-style-icon
I used to think that until I got a freelance gig for a custom dress shirt company. The cut of the suit and the shirt make a difference.
For example, a button-down collar is more working class since they’d be in situations where the collar could pop up. This makes it more casual than a collar with stays.