what we need is better material. The polyester shirts are crap.
Let me welcome you to 2006, if not earlier. That was the year I bought some Officials Choice shirts with the lightweight poly material that was open stich (sort of a micro-micro-mesh). I think the next year, Honigs came out with a soft, closed stiched shirt that wasn't bad, but the collar sucked. I had 2 of them and wore them for all varsity games I worked through 2009 (where I wore short sleeve). This was a very lightweight shirt. Last year, I got the Smitty shirt -- even lighter and more comfortable than the Honigs with a fabric that doesn't saturate, dries quickly, and has a nice, silky feel to it. I think the Smittys are the best, but I'm told that Cliff Keen and Gerry Davis make good shirts as well, though I haven't worn either. The CK shirts don't feel as good as the Smittys, but that's my opinion and its all personal choice. The Honigs are at least in the same league.
Bottom line, the shirt materials are top notch and can't get a whole lot better. You will never see a cotton or even a cotton/poly blend -- they used to have those but they faded terribly. Plus, they look horrible, hold moisture, are heavy, and otherwise impractical. Polyester is a generic term by the way and doesn't automatically mean the old double knit fabric of yesteryear. Go shopping!