This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Attire, such as shoes or slippers, for the feet.

n. An item of clothing that is worn on the foot; a shoe, sandal, etc.

n. covering for a person's feet

n. clothing worn on a person's feet

"I've observed lately that one of the new universals in footwear is the flip flop ... even among young people here."

footgear   

underwear    textile    headgear    mitten    pharmaceutical    over-garment    apparel    cosmetic    jewellery    moccasin