Almost any suit will do IF ITS TAILORED. A $300 suit can look better than a $2000 untailored suit.
Check out men's warehouse for some decent reasonably priced suits. Nordstrom's can have good prices as well.
My suggestion: Go dark blue (almost black) but NOT black (its too funeral). These are classic colors and will suit well almost any situation. Be warned, they dont last as long as a charcoal gray suit, so if you want something that will last and last, consider a charcoal gray one. Personally, I own one charcoal gray suit and all dark blue's, and one black.
I prefer single breasted jackets. For an explanation of the difference see:
https://www.dress2kill.com/single_breasted_suits.asp
https://www.dress2kill.com/double_breasted_suits.asp
Generally speaking the single breasted, in my view, looks a lot better. Some people prefer the other look. There's also the whole 3 button vs 2 button argument - either way, its a safe bet. 2 buttons tend to be the traditionally safe choice, but its really what you like more. Try both.
As for the back "vent" you can choose to have this opened or closed. I prefer closed, but opened will give you some extra breathing air and wiggle room when you sit down.
NO MATTER WHAT, GET THE SUIT TAILORED. If they ask if you want a full break, say yes.
Any shirt is fine, blue or white. For tie's, try and stick to simple patterns, avoid anything that is a "picture" or non-repeating design.
So lets talk tie's. I prefer ones where the pattern is not obvious and is part of the overall design. Here's an example of a pattern I think is too strong - too noticeable:
https://www.rugbyrelics.com/images/aaaaa ... Cowden.jpg
And an example of a tie that integrates it's pattern:
https://www.europe.co.jp/img/hermes/herm ... -lbl-1.jpg
Here's an example of a BAD tie because its an image. Works if you happen to be a nasa engineer, doesn't work otherwise.
https://www.exploratorium.edu/hubble/pla ... cr61_b.jpg
Try and avoid ones that are especially strong:
https://www.brooksbrothers.com/IWCatProd ... ent_Id=210
Ones that blend will look a lot better:
https://www.brooksbrothers.com/IWCatProd ... ent_Id=210
Also....
Do NOT wear white socks.
Make sure you use METAL collar stays - they will make sure your shirt color stays crisp. Plastic ones suck, they bend with the shirt, they are worthless. Metal ones look like this :
https://image.bizrate.com/resize?sq=160& ... &mid=24108
Any decent store will have them. Saks Fifth Avenue will for sure.