"You will be able to exchange the “Dream of the Fayth” token items for either the Abes’ attire or High Summoner attire after the conclusion of the Fan Festival in Europe."

So, from this, my conclusion is, you get one token per character, and it works like any token, you go to the vendor and choose an outfit. If that's the case, you may get both attires with one stream, only not both on the same character, but let's say you have one female character and one male character, then you get the female attire on your fem and male attire on your male.