Bee Hat

Queen Bee is the only source, so the outfit is a jungle project. She wakes up if you break the larva hanging inside a hive, and once you know the fight you can call her in deliberately with a summoning item instead of hunting hives. Each kill rolls the Bee Hat, Bee Shirt and Bee Pants separately, so it is common to end up with two copies of one piece before the third ever shows. All of it goes in social slots and does nothing for your defense.

In Expert and Master the pieces move into her Treasure Bag instead of dropping loose, the odds on each one improve sharply, and every bag hands over at least one piece of the outfit whatever else it contains. A Classic world can eat a long string of kills before the set completes. A bag world usually finishes it in a handful of runs, so if you want the costume and the choice is open, do it in a harder world.