In ancient Greek theatre, women were not allowed to act on stage.
A waxen figure called a 'Plangon' was used to represent women actors. This eventually evolved to mean a smaller human figure, such as dolls and playthings.
In Greek literature, 'plaggon' meant doll. This word is derived from the verb 'plasse' meaning "to form, shape, mold or fashion", giving us the modern word 'plastic'.