oooh that my apologies for not read very well:
If you want to add new items is better add it in item_db2 cause is more orderer for you, if you want to edit an oficial item just block it in the item_db.txt with "//" an add it in your item_db2.txt
Example:
Before
5528,King_Frog_Hat,Frog King Hat,5,20,,500,,4,,1,0xFFFFFFFE,7,2,256,,30,0,522,{ bonus bAgi, 1; },{},{}
After
5528,King_Frog_Hat,Frog King Hat,5,20,,500,,4,,1,0xFFFFFFFE,7,2,1024,,30,0,522,{ bonus bAgi, 1; },{},{}
This edition will place the Frog King Hat in the Costume/Style Upper