mannequin

Short definition from Wiktionary

Noun

1. 1
   A dummy, or life-size model of the human body, used for the fitting or displaying of clothes.
2. 2
   A jointed model of the human body used by artists, especially to demonstrate the arrangement of drapery.
3. 3
   An anatomical model of the human body for use in teaching of e.g. CPR.
4. 4
   A person who models clothes.