Since you just installed the game and didnāt install any mods, the items you saw are most likely from the seasonal Halloween content that already exists in the base game.
The items you saw are probably:
- Tiny wizard hat
- Pumpkin hairpin
These items normally appear during the Halloween period (around OctoberāNovember).
During that time, seasonal items can show up in Lady Annalieās clothing shop, so they arenāt related to mods.
About the ābrainā you saw in the debug menu, that item is called Dr. Blauās Special Brain Mix.
This item becomes available if you follow the Sanity path and accept Dr. Blaubleimās treatment after your sanity has been low for several days. Itās a medicine item that temporarily increases your sanity when used, although it may have some side effects.