Armour is now in Achaea. For now, only full suits are available.
YOu can buy armour at the same place you buy weapons, in Delos.
I'll write a help file on armour later, but for now:
Class restrictions on armour:
Monks: Can only wear leather.
Serpentlords: Leather, Ring, Scale
Occultists: Leather, Ring, Scale
Druids: Leather, Ring, Scale, Chain
Sentinels: Leather, Ring, Scale, Chain
Priests: Leather, Ring, Scale, Chain, Splint
Templars: Leather, Ring, Scale, Chain, Splint, Field Plate, Full Plate

Templars: No Full Plate is available right now, because it will be
armour that must be constructed specifically for the individual.

I advise you that I am going to put in some negative benefits to very
heavy armour, probably chain and above (I meant negative effects),
so buying the heaviest armour may not be the best solution, given
that armour is rather expensive at the upper end.

Penned by my hand on the 23rd of Aeguary, in the year 204 AF.