If you want something on the more breathable side that will stay comfy for a whole day, a good combat shirt will do you good. BDU sleeves with a breathable fabric torso area plus you get some patch space on the shoulders. I like the Condor ones. As for bottoms, BDU bottoms aren't too bad, but I like tactical pants from 5.11 especially their elastic ones. You can get them used or get reproduction ones for a decent price.
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