Here me out, those pilot helmets are pretty cool, mostly because they give the user full night vision. However, Pilot Helmets are pretty bulky and don't go with a lot of outfits (aesthetically speaking).
Yes, I know they can be covered up with wet suits and ghillie suits I think it would be cool if we could wear other helmets, hats, clothes, etc, but still gain the the benefits of full night vision with a more expensive option of night vision goggles. Since the pilot helmet costs $15,000 and gives level 3 armor, It would be fair to make the night vision goggles anywhere from 10-15k loosing the potential of having level 3 armor on your head, but giving you a lot more versatility with outfits.
We could also make it that if you do buy full view night vision goggles, you can only put on a certain helmet/hat. For example: Full night vision goggles may only be worn with hats that provide 0 armor.