We don't know how to obtain this item on the Dragonflight beta yet, but the most recent build added Armoire of Endless Cloaks along with many cloak-themed spells:
Fabulous Crane Cloak:
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Wrathion’s Cloak Closet – Gain Temporary Cloak Appearances Through Armoire of Endless Cloaks
Wrathion has been a fan of cloaks in past expansions, helping us acquire our legendary cloaks in Mists of Pandaria and Battle for Azeroth. Now in Dragonflight, the Armoire of Endless Cloaks will allow players to greet the Black Prince in style, generating temporary cloak appearances.
