Recommendations for Analyst Wardrobe Essentials?

I'm curious to see where Analysts get their suits, shoes, dress shirts, belts, and ties. I don’t want to look like a prick on the first day, and I also don’t want to sweat my ass off during the commute.

For context, I have a lean muscle build, so I'm ideally looking for something on the slim side but suitable for my broad shoulders. Any brand recommendations or tips would be greatly appreciated!

Thanks in advance!