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From ZeroWiki

Unlockable costumes and accessories found within Fatal Frame III.

Fatal Frame III Costumes

Rei Kurosawa

• Default costume - start of game.
• Black Yukata - beat the game once.
• Pinafore dress (maid outfit) - beat game in Nightmare mode OR clear all missions in Mission Mode.
• Red Yukata - beat game twice in any combination of modes.
• Suit/skirt - beat game in Hard mode 3 times Normal mode.

Non-unlockables

• Photographer outfit - shown in the opening FMV of the game, is sadly not an unlockable costume.
• Nightgown - not unlockable, but a default in the game for bedroom/night scenes at Rei's House.

Miku Hinasaki

• Default costume - start of game
• Blue Yukata - beat the game once.
• Pinafore dress (maid outfit) - beat game in Nightmare mode OR clear all missions in Mission Mode.
• Zero Costume - beat game on Hard / 3 times Normal mode.
• Pink Yukata - beat game twice in Hard/Nightmare mode.

Non-unlockables

• Pyjamas - not unlockable, but a default in the game for bedroom/night scenes at Rei's House.

Kei Amakura

• Default costume - start of game.
• Orange/Brown Yukata - beat game twice in Hard/Nightmare mode.
• Navy Yukata - beat the game once.

Accessories

Rei Kurosawa

• Hair ornament - beat game in Easy or Normal mode.
• Glasses - beat game twice in any combination of modes.
• Cat ears - beat game in Hard mode / 3 times in Easy/Normal mode.
• Headband - Spirit List: Complete.

Miku Hinasaki

• Barrette - beat game in Easy or Normal mode.
• Glasses - beat game twice in any combination of modes.
• Cat ears - beat game in Hard mode / 3 times in Easy/Normal mode.
• Headband - Spirit List: Complete.

Kei Amakura

• Browband - beat game in Easy or Normal mode.
• Glasses - beat game twice in any combination of modes.
• Fox ears - beat game in Hard mode / 3 times in Easy/Normal mode.
• White Glasses - Spirit List: Complete.

Ruri

• Ribbon - beat game in Easy or Normal mode.
• Bell - beat game in Hard mode / 3 times in Easy/Normal mode.