Druids, like clergyman and holy knights, are deeply steeped in tradition. Refusing to take more from the Earth then they need, sleeping amongst stars. But perhaps most detrimental to their survival, they refuse to wear anything cast from metal. This armor seeks to change that. 

Typically coveted by druids the world over and rare marketplace finds, these breastplates are sung from a rare strand of hardwood by masters of the druidic craft, these armors seem to be grown rather then just made, with natural curves along the breast, as well as wooden straps that wrap around the back. A faint bit of most climbs along edges of these breastplates, and budding branches seem to grow occasionally from curtain parts of the armor. Given enough time, they sprout leafs. 
Though these armors seek to give druids the world over a bit more heft to their person, it comes at a steep price. Like most woods, flame seems to cling to the armor. And though it's sturdy enough to withstand most flames, the wielder likely isn't, and will become Vulnerable to flames. Though, once attuned to the armor, this Vulnerability can be shifted to another druidic element, such as Frost, or Lightning once per day.
Though, there are hushed whispers of ways to cure its achilles heel permanently.

This armor consists of a fitted metal chest piece worn with supple leather. Although it leaves the legs and arms relatively unprotected, this armor provides good protection for the wearer's vital organs while leaving the wearer relatively unencumbered.

Notes: Long Rest.