To make these accessories available to be bought at the Night Shop, meet these requirements.

Accessorie	How to unlock
Bunny Ears	Clear Hard difficulty.
Crimson Fox Mask	View the Shadow Festival Ending.
Crimson Glasses	View the Crimson Butterfly Ending.
Eye Patch	View the Hellish Abyss Ending.
Maid's Headdress	Ghost List 53% (100+ ghosts).
Maid's Tiara	Ghost List 53% (100+ ghosts).
Pastel Shades	View the Crimson Butterfly Ending.
Titanium Glasses	View the Crimson Butterfly Ending.
White Fox Mask	View the Shadow Festival Ending.
White Lily Hair Ornament	View the Frozen Butterfly Ending.
White Plumeria Hair Ornament	View the Frozen Butterfly Ending.