This style of armour is preferred by Mantis and Dragonfly warriors, since it can be manufactured without the need of aptitude. It is shaped from the carapaces of various insects, with Mantis in particular fond of using that of their namesake. The Commonweal have an eye for aesthetics and frequently lacquer the chitin in bright, jewel-like colours. This may also strengthen it.
The biggest flaws chitin armour are common to many inapt creations. The amount of time taken to construct it makes it inefficient for protecting large armies and it is not capable of standing up to the ever more powerful technologies of the apt.
Technically, the bits and pieces of protection that bandits and irregulars put together from insects can also be described as Chitin armour but it is not the first thing that springs to mind.