You might go on tiptoe while wearing this (4)

I believe the answer is:

tutu

(Other definitions for tutu that I've seen before include "South African archbishop, b. 1931" , "Giselle's skirt" , "Ballet dancer's short skirt" , "8 [BALLET] term" , "Ballet-dancer's skirt" .)

I've seen this clue in The New York Times.

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