add to your item_db (your armor) script > sc_start SC_ITEMBOOST,1800000,200;
example:
2309,Coat,Coat,4,22000,,1200,,42,,0,0xFFFFFFFE,63,2,16,,0,1,0,{ sc_start SC_ITEMBOOST,1800000,200; },{},{}
don't forget to reloaditemdb or restart your server, good luck