Most seem to be pretty simple like charisma boost or some sort of percentage increase on a stat, but some seem to be not as obvious.
For me, the best weapon one is double bullet, which actually only consumes one bullet but basically does double damage.
The best armor for me has been one with "enemies have a harder time detecting you when you are sneaking and not moving"
If you crouch and stand still you go invisible. I didn't see that one coming
