Can this be a stealth modifier that replaced bullet proof vest so they are mutually exclusive. It could only provide detection resistance in say grass and shrubs. Because honestly the enemy has an auto detection radius that makes stealth next to impossible.

Honestly just this morning i was hiding in a bush and the enemy patrolled right past me, so i moved to the next bush and waited and he got 6-7ft away on his patrol and turned and shot me without saying anything like enemy spotted.

If he is dumb, then no one would heard him shouting.
Don't worry - you just had a very bad luck.
BTW how many gaming hours do you have?

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I had experimented with the stealth in game and made a Ghillie suit that allows you to be more stealthy in my mod if you want to check it out. Although making the Ghillie suit change your detection chance in bushes and other brush is not possible for me to make due to my low amount of experience.