Source: Wikipedia

Wyvern-scale armor. Heavy armor, AC 3 [16]. When properly worked by a knowledgable armorer, wyvern-scale armor is amazingly light. So light, in fact, that it both floats and does not add to encumbrance. Maintaining the armor in fighting condition requires careful and continuous oiling and care, though no special or expensive oils are required. If wyvern-scale armor is not oiled for more than a week, it becomes brittle and begins to fall apart (this process cannot be halted or reversed; the armor is ruined). It is assumed that knowledgeable PCs will maintain their wyvern-scale armor adequately, and this downside will only manifest if the armor is lost or the PC is trapped away from maintenance materials for an extended period of time. When freshly made, wyvern-scale also has a very distinct aroma, undetectable by most humans, but clear to many animals and beasts, making achieving surprise more difficult in some circumstances (the scent may be perceived as either terrifying or aggressive, depending on the creature in question). After proper aging, the scent is said to dissipate, but experts estimate that such an aging processes requires the better part of 1000 years. Crafting cost & time: 1000 GP and 1d6 weeks, assuming access to a knowledgable craftsperson. One wyvern yields the materials for 1-2 suits.

Purple worm leather. Light armor, AC 7 [12]. One part of the dermis of the giant violet worm can be made into effective, flexible, and durable light armor. The armor, if properly made, remains partially alive (though its method of sustenance is unknown), and it slowly leeches alchemical compounds into the wearers body, granting a +2 bonus to saving throws versus poison after the armor has been worn regularly for at least one week. The wearer’s eyes and tongue also slowly take on a purple hue at this time. The armor feels slightly warm to the touch. The worm skin is too bulky to combine effectively with other forms of armor (such as plate + worm skin) but can be worked into heavy rain-capes or coats for those that seek only the poison resistance and cosmetic effects. The poison resistance does not persist when the armor is removed (sages suggest that the skin must release some further compound in response to poison). Most skins result in a vaguely tigerlike pattern of alternating brown and vibrant purple, and the color does not dull with age. Purple worm leather can be killed. Assume the armor needs to make a save versus death if the wearer is reduced to 0 HP by trauma (use the wearer’s save number). It will also mend itself naturally. Crafting cost & time: 100 GP and 1 week. One worm provides materials for a number of garments equal to its hit dice.