I want several outfits, A1, A2, …, An, and B, with the following properties:
Each outfit Ak can never be bought or sold.
Outfit B can be bought or sold anytime.
Each outfit Ak can be seen in the outfitter if and only if the player has both outfit Ak and outfit B.
I am pretty sure this can't be done "trivially". I want a solution that is simple to implement and uses few resources. Let's say a maximum of 3 additional resources. In particular, I will not accept a solution that involves a crön, nor a solution that involves a duplicate outfit Ck for each Ak. A mission is allowable if and only if it is offered from the BBS, so the player actively chooses to start it.