First Person servers are great because they are intense and immersive but I think that adding 1P visor textures would greatly change the way a player uses overface headgear in DayZ.

For example if a player is wearing a Motorcycle Helmet then it should look like they are wearing one in 1P (looking worse depending on condition) with a filter over the breathing SFX to match the headgear being worn.

The most interesting thing behind this idea is that the player may think twice before wearinng a Badly Damaged Motorcycle Helmet due to the visual damage on the visor which may distort their vision. This will also encouage players to damage their enemies' head gear to possible gain a tactical advantage causing the other player (assuming they survived) to remove their overface headgear to see clearly.