Tier 3 Question

Ok so with the new transmog changes (allowing all armor types to collect all other armor type appearances, ex: warrior can collect priest tmog) Do we know if that applies to Tier 3?

For example, if I go buy the Mage shoulders from the BMAH on my Warrior, will I still get the appearance? Or do I need to still buy it on my Mage?

Thanks for reading, (and help in advance)