Interesting Tidbit about the Draken Mail/armor I found for lore reasons.

Apparently, the Draken Mail is holy or sacred and is imbued with magics of Dragoon's past and a set is crafted for every generation of Azure Dragoons. The Draken mail, pending on who you ask, is a required piece to complete the power of an Azure Dragoon and it allows the user to perform Dragonfire Dive, an extremely powerful and high level technique exclusive to the Azure Dragoon and few high level Dragoon's.

My head cannon though kinda believes that a bunch of bs though. Regardless if you are an Azure or not, you should be able to perform high level techniques like Dragonfire Dive, even if you dont have or wear the Draken mail, as long as youre strong enough as a Dragoon to use and perform it. This head cannon is further enforced by the fact that you can still use Dragonfire Dive, even if you wear diffrent armor aside from Draken Mail, like Austrum Mail or the High Allagan gear.