As CK above has pointed out, within reason most clothing won't make a difference, & ubacs are the best compromise of keeping cool while retaining an element of camouflage & covering the pasty white bits that don't like bb hits.
To this end I've now got ubacs in od & black, as well as mtp & vegetate, covering most of my loadout/camo needs.
The bigger issue is your load bearing equipment, full vests may look very tacticool, but they insulate the fuck out of you, you'd probnbe cooler running around in a puffa jacket with a box mag, never mind people feel the need to cover every inch of mole.....= more weight.
We all do it, I know I did when I started playing bout 17 years ago, but now I'm older, wiser, & a lot fatter, so I've now redefined what I use, a loaded warrior dar chest rig with back panel/hydro for weekenders or low cap milsims, but also some much lighter rigs for regular gamedays, such as Costa style thigh rigs where I only run 3 hicaps & a couple of pistol megs (only use single shot so that's loads), & maybe a small slingpack for my water (& chokkie ?), meaning most of my body is un-insulated, way cooler & much more comfortable.
