Help Item keeped in inventory

[0flee]

How i can make on l2jsunrise an item in inventory for effect?
Player just keep in inventory to get effect. (Without skill active/passive)
I have 

 <item id="22600" type="Armor" name="Tattoo of Brave Cat. 1">
		<set name="icon" val="icon.skill1326" />
		<set name="immediate_effect" val="1" />
		<set name="is_tradable" val="false" />
		<set name="is_dropable" val="false" />
		<set name="is_sellable" val="false" />
		<set name="is_depositable" val="false" />
	<for>
	   <add stat="mDef" val="500" />
	</for>
	</item>

Item appear in inventory, but effect from "mDef" not. What i miss? Thank you

[TGSLineage2]

If I understood correctly, you want to add a defense stat to a custom item, but when it reaches the player's inventory, is it not appreciated? If this stat is added to the player's stats when he has it on, then to make it Visible in the item's tooltip, it would have to be added in the system's armorgrp.dat file, I don't know if that is the question

[0flee]

I appreciate your time to post. I try all variants. Now i try a second variant. To add with skill passive, and it's working. Thank you! Can close topic, solved.

[0flee]

Someone can help somehow?