A dressmaker's dummy is a body-shaped form for fitting garments on. Pin it to the dressmaker's dummy.
The adjustable kind can be set to a person's own measurements, which is the point. A dressmaker's dummy lets somebody fit a back they could never reach on themselves.
1noundressmaker's dummyA body-shaped form for fitting garments on.
“The dressmaker's dummy stood in the corner wearing half a coat.”
dressmaker's dummy is equipment.
Practised in Knitting & Sewing