Loot from player's inventory

Make a method to get loot, that equipped by entity with /loot command. It'll be cool, if u can get it without changes for example, to chest. That'll help however, for "I know only commands"-type of admins. It can don't touch armour, but getting all other items from inventory, for example - Bob, Bob has a super-duper potato. We can just write /loot get_loot (for example) @a[name=Bob] and then we get his potato.