Pistol in pants pulled out to shoot & get shot in the legs pants get ruined is ruined gun is ruined.. yet the gun was in your hands not in the pants.

Same with larger backpack weapons like the MP5.

Suggestion:

When inventory weapon is drawn into hands.. slots are free.

Or.

System in place that knows that when the inventory article of clothing is ruined the weapon was not actually in it.. thus cannot be damaged.