I think one of the problems with some of the comments I read here about how pool players dress, is the delusional assumption that pool players understand what that means. Just because you put on a suit or slacks with a button-down, doesn't mean you look good. I'm willing to bet that about 80% of the pool playing contingent doesn't understand how a suit should fit.
I fully agree with everything that Cleary has posted on AZ about dress codes. Up to date I have attended several events that require dress codes for pool players. These include Turning Stone, Ultimate 10-ball, World Straight Pool and the BCA Championships in Vegas. To say that a dressed up player automatically looks better is a joke. Most of these guys don't have a clue about how to put themselves together properly. If anyone thinks that a guy wearing jeans/sneakers/t-shirt looks worse than a guy who looks like he pulled his suit out of good will, or the guy swimming in his vest, or even better... the guys who "cheat" the dress code by wearing black high tops with their tuxedo pants or black shiny sweat pants instead of slacks, the guy who wears a baggy ass polo shirt that looks like a dress but fits the collared shirt requirement, then you're just fooling yourself.
Any dress code that's good enough for golf, should be good enough for pool. Fitted slacks, comfortable shoes and a polo should be sufficient for any tournament.
That being said, I would fully endorse the UA pants. I use all their gear for my fitness training and their quality is top notch and not as overpriced as people might think. Good athletic gear is always a little pricey.