Diamonds are a mans best friend too!  

This is a concept to set any "hat" you want by right clicking a item/block.  Not only that, it's also able to adapt to many different functions or events. Just by checking it out you can see how it can be used for a interface or be used in games.  


If I didn't explain well to understand, check out the video.. it reveals all.



Here's some commands that briefely explain how it works.

Scoreboards
- /scoreboard objectives add HatID dummy
-/scoreboard objectives add Hat_Joined dummy
-/scoreboard objectives add SetHatID stat.talkedToVillager
-/scoreboard objectives add HatSuicide dummy

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0}  Fill Clock*

1}  /scoreboard players set @a[team=Gamemode4] HatID 1 {SelectedItem:{id:minecraft:stone}}

2}  /execute @a[score_SetHatID_min=3,score_SetHatID=3,score_HatID_min=1,score_HatID=1] ~ ~ ~ /replaceitem entity @a[score_SetHatID_min=3,score_SetHatID=3,score_HatID_min=1,score_HatID=1] slot.armor.head minecraft:stone

3}  /scoreboard players add @a[score_SetHatID_min=1,team=Gamemode4] SetHatID 1

4}  /scoreboard players set @a[score_SetHatID_min=4] SetHatID 0

5}  /execute @a[score_Hat_Joined_min=15,score_Hat_Joined=15] ~ ~ ~ /summon Villager ~ ~1.2 ~ {CustomName:SetHat,NoAI:1,Silent:1,Offers:{}}