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 totally agree that it just looks like a suit and tie when he's the only one in the photo. I don't know enough to appreciate the details, but if you put someone in something very nicely tailored (but not the stupid skinny short suits) next to Trump's baggy bullshit, one looks put-together and one looks like a kid wearing his older brothers suit to a funeral. Sure, body shape is a bit of it, but a good suit and a good tailor can make a huge difference- it's about looking like your clothes fit, not just about looking trim.