Nieldic Armor

The Nielda don't do heavy armor.  Just wanted to start with that.  Plate is unheard of, only a few use it and they're all huge(which for a Nielda is around 7'6"- 8'+, 3-4 hundred pounds of muscle, and broad). 

For most Nielda sturdy leather is standard.  Generally just a single layer of leather is as much as they'll have.  A full suit of armor will be greaves, legguards, bracers/gauntlets, a breastplate, and a helmet.  Upper arms might get a bt of armor, but it's rarely actually worn because of the inconvenience of putting it on. 
Later generations will use what is known as 'tech-plate'.  Tech-plate is a layer of lightweight alloys over a set of electronics that increase speed and strength, as well as producing an energy dispersing shield.  While it includes all of the same armor pieces as the older leather sets, it tends to be worn as a complete set because of self sealing pieces.  It also physically covers more than the leather did.  However, tech plate is used only by the military, who gets it dirt cheap.  The only downside to tech plate is that the alloys inhibit magic usage, making it a liability to mages. 

For those who have money on the other hand, there's composite leather and steelsil. 
Steelsil is a product of magical tampering with spiders.  A long time ago, a mage realized that spider webs had greater tensile strength than iron.  So he developed a method by which to harvest great quantities of spider web and made clothing out of it.  It didn't work quite how he expected, and died as a result. 
Another mage took up where he left off and began working on breeding spiders to produce large quantities of the strongest spider web.  At a certain point, he managed to make it good enough and cheap enough to sell it as 'spider silk'.  The clothing made of it remains much beloved by the nobility for its ability to hold enchantements and dyes.
A third mage took up from there.  Using alchemy, enchantments, and the bones of several enemies, he transmuted the properties of Kraj into the spider silk.  The result was steelsil, fundamentally the mithril of the Nieldic world.  Light as silk(and as open to enchantments and dye), and strong as kraj; making it capable of withstanding direct hits from energy weapons, spells, and swords.  Steelsil is much beloved by mages, and is surprisingly affordable to those able to provide the kraj. 

Composite leather combines all the strength of steelsil, with the padding of leather.  It's made by compacting several layers of leather around and between layers of steelsil.  It's the prefered armor of the nobility, as it allows them to fight in melee with greatly reduced threat of injury and no inhibition to magical ability.