Athletic wear is science'd up to accommodate the inevitable sweating, but with summer coming, unless your main activity is sitting in a freezer case feasting on Choco Tacos, you're gonna be sweating no matter what. Grab similarly technical casualwear, from Angry Dragon 99
Led by an LA-based Atlanta native and marketing/music/artistic maven who's worked on projects for Toyota, Nike, and Budweiser, Dragon's a collection of polos, jackets, and custom-designed gear intended for "men who operate at maximum levels", but nonetheless wear shirts. Basic polos come in seven colors (Black Jack, Peppermint, Maliblu, Gun Metal...), and're made of 100% wrinkle-resistant, super-loose-knitted polyester (that couldn't be further from what's in Dad's closet) for breathability and rapid sweat evaporation; each top features contrast-color piping and top-stitching on the sleeve, collar, & tail, and a scowling, cartoon dragon logo, who's only mad because nobody ever offers him a puff of the magic. They step things up a bit with the "Fire Starter" polos, featuring similar details but in brighter, attention-grabbing colors (Blue Flame, Yellow Flame, Orange, Purple...); if you're craving exclusivity, they also offer a limited run of 99 shirts every year featuring the dragon logo in different getups, with this year's version in white w/ black & white satin trim, black crystallized buttons, and the dragon in a top hat and red bow tie -- which means he'll be way over-dressed for any place that lets men in with lizards on their boobs
If a run of 99's not limited enough, you can also get one of Dragon's artistic collaborators to custom-design a personalized blazer, hoodie, jewelry, sneakers, or even a baseball jacket -- perfect for when you switch from Choco Tacos to sundaes in tiny Braves helmets.