I'm being dense, I guess, but I can't find it.
Coming soon (tm)
From elsewhere:
@MPQBlaine said:NOTES Costumes take time, money, and approvals so we're aiming for an early 2024 delivery date if the community completes this goal. We will provide more info post-anniversary on how we plan to get your input for the costume! https://forums.d3go.com/discussion/89219/10th-anniversary-community-challenge