Unappreciated hairstyles? (4-5)

I believe the answer is:

flip-flops

(Other definitions for flip-flops that I've seen before include "Beach footwear" , "Summer shoes" , "Casual summer footwear" , "Casual footwear - backward hand springs" , "Beach shoes with toe thong" .)

I've seen this clue in The Wall Street Journal.

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