Narcissus

At this point, probably every transmog enthusiast knows about Narcissus, but if you don't - you've come to the right place.

It is a very aesthetically pleasing AddOn created by Peterodox providing you with custom features to release your inner fashionista. From their CurseForge page, this is the list of features:

• Character Info (Armory)

• Transmog Display

• Photo Mode

• Barbershop

• Achievement Panel

But I do know they have even more useful stuff, like a neat gem socketing panel for Pandaria Remix.

With Narcissus you can quickly view all the relevant information for your character:

And as you've already seen in the image at the top of the page, you can neatly share your unique transmogs with custom animations, visual effects and more:

Their Photo Mode even has a green screen mode where you can create images of your character in custom environments, or easily crop out your character. Heck, you can even create machinima with it. Here's an example of what I'm talking about:

You can even make animated GIFs easily, to again, display your sexy ass transmog and flex on your friends for finally getting tusks or some other rare drop:

All of this is definitely not the end of the features, so go ahead and download it for yourself. They also have a Classic version :)