Dickie
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A piece of neckware that is supposed to simulate an undershirt, so that one only has to wear the dickie and an overshirt. Were very popular in the sixties, due to the [Beatles] use of them. They were mostly [starched] and bleached, and meant to look like a sweatshirt. The Beatles used them so they wouldnt [overheat] while performing, but could still look dressed up.
Dickie meaning & definition 1 of Dickie.