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:
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Character Info (Armory)
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Transmog Display
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Photo Mode
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Barbershop
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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: