Please see If you can help.

[Hadi Doogle]

@TinyBigJacko if you place the item in a car and right click with a helmet already on arma decides to let you use it. This works with any dlc and any weapon/gear piece.

 

[TinyBigJacko]

@TinyBigJacko if you place the item in a car and right click with a helmet already on arma decides to let you use it. This works with any dlc and any weapon/gear piece.

As I said, then... that's ARMA for ya! Nothing much we can do - other than remove all wearable DLC content, and that's not going to happen. At least we know what the cause is, if this turns up again though, and can steer affected players to a solution.