Can a Fire Mage dress in blue and other colors or is it preferable to dress in colors that match the spells such as oranges and reds?
Sometimes I like to harmonize my transmog to my spec; I’ll have different outfits for Disc or Shadow, Frost or Fire, Blood or Unholy.
Sometimes, I just like the color blue, or there is a certain piece I want to wear.
Do what you want to do, transmog however it makes you happy to. 
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