Zoroastro, the legendary wizard of Ahrkren--City of Madness--knew the secret to creating these cloaks.  Generally, their magic only lasted a single night and at sunset they simply disappeared, leaving only the silver clasp--which was worth a few gold pieces in its own right.

The cloak doubled a person's stealth while in partial or total darkness.  In the light of day it has no effect.

The cloak is embroidered with the head of a wolf on the left breast.  The wolf can breath fire for 2d8 damage and can recharge every round on a 5 or 6 on a d6.

The cloak protects its user from cold, giving him/her resistance vs. cold.

The silver clasp has a Z with two skeletons reaching up toward it.  It is worth 5gp.  However, most people prefer to keep it as a trophy.

After a character puts it on, the cloak will disappear at the next sunrise, leaving only the clasp.