Bueno, paveando en WoWHead encontre este item:
Epic Purple Shirt - Item - World of Warcraft

Te lo dan por las cartas del wow, como dicen los comentarios:

"Where does it come from and how hard is it to get?
The Epic Purple Shirt comes from the World of Warcraft TCG (trading card game)

TCG Expansion: Blood of Gladiators (Press Release)

Card: Center of Attention

Rarity: 1/181 booster packs (speculative)

Distribution: Blood of Gladiators booster boxes contain 24 boosters and cost approx $50 USD (inc. shipping), therefore the average cost of obtaining this particular loot is $377.00"

Estaria bastante bueno que lo agreguen, asi como ahora esta la sillita de pesca o el trinket que te transforma en ogro