Try to use this item script
2220,Hat,Hat,4,1000,,200,,2,,0,0xFFFFFFFF,7,2,256,,0,1,16,{bonus2 bExpAddRace,RC_All,100;},{},{}
Change 2220,Hat,Hat,4,1000,,200,,2,,0,0xFFFFFFFF,7,2,256,,0,1,16, to your headgear info (item_id, name, view,...).
And script bonus2 bExpAddRace,RC_All,100; give your item bonus 100% exp.