http://www.moonshyne.org/GM_At_A_Party.jpg

He was level 60, tagged <GM>, wearing only the full Gamemaster's set (Gamemaster's Robe, Gamemaster Hood, Gamemaster's Slippers).

I'd ticketed him reporting a goldseller, and invited him to the party. To my surprise and delight, he showed up (well, we did offer cookies). He liked the cookies, explained he was from a small island far away where they watch over Azeroth's children, and had a couple Darkmoons before he had to leave � vertically, straight through the ceiling, jumping three times on thin air (the floating flag, I'm thinking).

This robe is the same model as the White Linen Robe (with the palette swapped to dark grey and blue). And no, you won't ever get it (unless you fancy working a customer service position in a popular online game).

I'm pretty sure that the Gamemaster's Hood/Robe/Slippers look like the garb the actual Gamemaster's wear when they have to show themselves to you in-game.

If you've never had the pleasure (or pain, depending on how helpful the GM was) of dealing with one, you can see what they look like here:

http://www.wow-europe.com/en/recruitment/gm-island.html

It's also a pretty entertaining read.

http://classicdb.ch/?item=12064 - Hood
http://classicdb.ch/?item=2586 - Robe
http://classicdb.ch/?item=11508 - Slippers

Drop? That's a gamemaster's item, meaning only gamemasters get it.
Sheesh, arcane intellect, anyone?

its a nice robe. actually i saw a GM link it today. We killed golemagg and since there was no drops, the whole guild ticketted a GM. He yelled to us, in MC, but was invisible. We joked with him (he was pretty funny) It was like speaking to a god -.- but someone yelled back we wanted to see his shaman stuff ^^ He came visible and the maintank was hurry to inspect this ^^, then he was gone again :) that was the most coolest GM i ever had meet..