First, read "The pilgrim's path at someone's bookstore. It will reveal Ghostgate and some other areas on your map. Next, get a scroll of lock and an Almsivi Intervention scroll (NOT DIVINE)from anyone you can find or learn the spell. Next, go to Ghostgate, east of Ald Ruhn. Go into the tower of Dusk, and go down the stairs. You'll find a Dark Elf in plain clothes who sells all pieces of Glass. You'll recognize him by his room, being surrounded by Glass Armor. Lock the door behind you, and beat his face in. He wields a Warhammer, so be pepared. You'll also get a bounty, but Almsivi Intervention will take you out after you swipe all the glass you can carry.

After this, use Almsivi Intervention. Once at the nearest temple, drop all of your stolen items so the guards don't confiscate it. Pay the fine and pick up the glass. Congrats. You've got armor or cash!

Warning- Glass armor is a light armor, if you use Unamored, Medium Armor or Heavy Armor, this quest might not be for you.