Let us trade rare costumes for other rare costumes from the same egg

Suggestions
1

Imported from legacy Flarum.
Original author: VanyrMaelstrom (Flarum #39)

Let us trade rare costumes from eggs/boxes for other rare costumes from the same box. A fee can be applied as well, even like 25m zeny is fair imo.

2

Imported from legacy Flarum.
Original author: GM_Icecold (Flarum #3)

i think we have now a lot of more players so costumes can be traded between players.