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Well considering that the honour vendor is in a place only accessible by flight, and that you can't wear the gear until 90...the answer is 90.
Why would you want the gear before you can wear it anyway?
They changed it in Cata so that you have to be the appropriate level to purchase the gear (90 today).
Prior to that you could spend your honor beforehand, but they changed it. I don't particularly like this change but I can see why they did it.
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