ca someone make a plugin that auto adds these effects to armor.

full leather gives : speed 2
full chain gives : speed 1 and strength 1
full iron gives: strength 2


I don't care about this one, but if you feel like it have full diamond give weakness 1 and slowness 1

or if you know of one which lets me do something like this please tell me

 

If you know a bit of code you can probably use what I wrote up as a template.
I could not find a suitable class since the inventory class is deprecated, I hope you can find one yourself. Sorry that I could not create it fully, I lack the time

Code:java

@EventHandler
public void onPlayerJoin(PlayerJoinEvent evt) {
Player player = evt.getPlayer();
if (player.getInventory().getChestplate().getType()
.equals(Material.LEATHER_CHESTPLATE)) {
player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED,
2000, 10));

 

are you still need that plugin?
if so feel free to try this one:
https://dl.dropboxusercontent.com/u/24414601/ArmorsetEffects.jar

config is empty at first start,
to add Armor Effects just use:
/armor add <Armortype> <PotionEffectType:[optional]amplifier>
ArmorType: can be leather/chain/gold/iron/diamond
PotionEffectType: = one of the Potion names as seen here (e.g. jump, heal, speed)
amplifier: optional, default = 0, Level of the PotionEffect

example:
/armor add gold jump -> would add level 1 jump potion effect to gold armor set
/armor add leather speed:2 -> would add level 2 speed potion effect to leather armor set

To remove an Effect just use:
/armor del <ArmorType> <PotionEffectType>

To reload the config file use:
/armor reload

all commands permissions are set to op by default, permission is "armorEffects.commands"

Let me know if it works as you want and/or if you need anything else, changes etc.

Todo:
allow IDs instead of PotionEffect names