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Yes, there is a movie entitled Mannequin. It starred Kim Cattrall & Andrew McCarthy.
Mannequin - 2012 was released on:
USA: 23 April 2012 (Arizona State University Student Film Festival)
A mannequin shirt is either a shirt designed to be worn by a mannequin or it refers to s mannequin that displays shirts.
i'm trying to find out too, although it was a play on BBC2 , I think...
mannequin mannequin