Known issueHow-toUpdated · 3 replies on Steam
With Your Coworker: How Do You Get New Items?
Short answer
Suggested fix (unconfirmed): Switch the "Outfits" tab view from the gallery view to the "Outfits" view by clicking the book icon in the top-right corner. Ensure you have the necessary pose unlocked and selected for the outfit.
The problem
I get the vouchers, but some items seem to be on my inventory, yet I can't equip them and they say "Market" I'm missing something, I don't quite understand how the items work :/
Did this work for you?
Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.