You must fulfill certain conditions before purchasing these accessories in the shop.

Accessorie	How to unlock
70's Sunglasses	Purchase the "Bear-made Glasses" accessory.
Blue Headphones	Purchase 3 accessories for Chie.
Gag Glasses	Clear 5 songs in Free Dance.
Long-nose Glasses	Purchase the Spiral Brooch item in the Shop.
Pink Headphones	Purchase 3 accessories for Chie.
Sunglasses	Purchase the "Bear-made Glasses" accessory.
Tanaka Gold	Spend a cumulative 600,000 P$ in the shop and purchase the "Tanaka Mask" accessory.
Tanaka Mask	Spend a cumulative 300,000 P$ in the shop.
Yellow Headphones	Purchase 3 accessories for Chie.