I was thinking it over and one of the main things about this game is how loud it is in say, King of the Hill, you cant take those earphones off without risking hearing damage, yes I could turn down the effects sound but my main way of staying aware of the enemy is listening for footsteps, so I thought, one of my favorite hats in the game is the Rangemasters cap, which is simply a hat with a pair of shooting muffs on it.
Now judging by the mic and such on it its a high quality pair of the electric muffs, meaning its designed to block out sounds above a certain decibel while leaving you able to hear normal sounds that wouldnt cause any problems.
So what if, not saying Bohemia as much as maybe the modding community can do the work for them and they can tie it into the main game, could make clothing have more effects like that? I was also considering maybe Opfor clothing, since its air conditioned, should provide certain perks for that as well as that would keep a soldier comfortable in pretty much any environment for extended periods of time.
Same for say the Chest Rig, while im not a fan of it being there by any means, theres a water bladder on the back, maybe that could have perks as well?
Now honestly dont take this super seriously as I also feel the game would get weird when you do stuff like that, makes it feel more like an RPG game or something when armor has abilities and buffs. But maybe some passive, not announced perks would be interesting?