So here is how it happened.
I was running around a long way and finally reached Svetlojarsk.
I have taken some damage from zombies, ran through the town and ended up with Worn clothes at most.
Suddenly when I disconnected from a server when I was loosing connection and reconnected on a different one my pants were ruined, and the medikit inside of them was also ruined. However, the other two items I kept there were still pristine. This isn't the first time happening.
P.S: I didn't check if there was an issue like this before. Only 1 person reported the same issue by far: http://feedback.dayzgame.com/view.php?id=9564