Transmogrification tool by Wowhead

Wowhead introducted a nice new transmogrification tool. It shows all the sets that match your class/armor type.
The screenshots were all taken by default on a human female model. However, if you would like to see it on a different model or from another angle, simply click on set's page and click the "View in 3-D" button on the top. You can change the options in the new pop-up window for race and gender.

Wowhead Transmog Search Tool

I think are some minor bugs still in it. Selecting usable by Death Knight gave me the Dreadnaught's Battlegear set, which is a warrior set of course. Also this set isn't available anymore, however it's still an option for the warriors who saved this set from the old Naxxramas.

Announcement on the Wowhead new site: New Site Feature: Transmogrification Sets
The search tool itself: Transmog Sets