i need an item to only work with custom values

[Thirantos]

I am new to script and I tried to make a custom chestplate but I have no idea how to do this.

I still need the normal leather chestplate available but I don't know how to do that.

this is the code I have but it doesn't work

on inventory close:
    send "&c&l[DEBUG, %player%]&f&l inventory close detected" to console
    player's gamemode is survival
    player is wearing leather tunic with the data value 5:
        send "&c&l[DEBUG, %player%]&f&l chestplate detected" to console
        allow flight to event-player
    player's gamemode is survival
    player is not wearing leather tunic with the data value 5:
        disallow flight to event-player
        send "&c&l[DEBUG, %player%]&f&l no chestplate" to console

reload errors

[15:58:41 ERROR]: [Skript] Can't compare a player with 'wearing leather tunic with the data value 5' (chestplate of air.sk, line 4: player is wearing leather tunic with the data value 5:')
[15:58:41 ERROR]: [Skript] Can't compare a player with 'wearing leather tunic with the data value 5' (chestplate of air.sk, line 8: player is not wearing leather tunic with the data value 5:')

I've tried searching the docs but not the forms

 

[inxane]

How about a custom name on it? You can check for a custom name, and then do your custom actions if it has been detected.

if player is wearing a leather chestplate named "&4Custom Chestplate":
    # do something

Just make sure it has a color in the name, otherwise, players may be able to obtain such chestplates with an anvil.