Problem: Placing Space Helmet in Boone's inventory equips the Space Helmet and deletes the Beret permanently.
Steps with how this happened for me:
Location it happened: Broc Flower Cave, in the lab area (Might help?)
-Boone is wearing his Beret (Which he never wants off his head)
-I open equipment through companion menu with Boone (Companion)
-I trade him Space Helmet (To give me some free space)
-Noise of equip happens
-I close menu after trade complete
-He is wearing the Space Helmet instead of his Beret (As it would happen)
-He then asks for his Beret back
-His own Beret has disappeared. It is not dumped on the ground, it is not in his inventory, it is not in my backpack. It has vanished from existance.
Thank you Bethesda and Obsidian for a great game. Non sarcastic.