The first augment a player is likely to encounter are leathercrafter's armor kits. These kits range in level, mostly providing a simple armor boost at lower levels. Higher level kits grant stats often sought out by many classes, and spell resistances. In most cases kits can be applied to gloves, leggings, boots or chest armor.
Like other augments these will overwrite an existing permanent enchant or augment, and will be overwritten if another augment or enchant is applied to the item.
Armor kits have both a player level requirement for use, and an item level requirement for application. This prevents a high-level player from applying a high level kit to a low level item, and then giving that item to a player who would not have been able to use the kit.
* Can also be applied to shoulder items.
** Leg armor can only be applied to leggings.
*** Glove Reinforcements can only be applied to gloves.