This is a fun dressmaker's mannequin toy play set. After buying a commercial product my daughter instantly said “I need more mannequins” and thus, a design was created. Now I have a lot of mannequins and a lot of fashion challenges in my life. 

Required parts:
Orings - 11mm OD, 7mm ID, 2mm thick orings. Can easily be found on amazon. 

Cloth - 150x150mm cloth cuts. 150x100 cloth cuts. 100mm ribbons for belts. 

Print Tips (done on an ender3 v2 in PLA):

Base - Print with 2.8mm thick walls (or multiple of your nozzle). You want a really thick wall to keep the threads from snapping off when your kids are playing. 

Retainer - Print standard settings, 20% infill, with the “hammer down” orientation. Support to base plate. Print 4x of these

Mannequin - Print standard high quality settings.

The threads can be a bit tight. Depending on your slicer you may need to chase them with a tap and die. M12x1.75.

Source: 

Mannequin was modified from omegadarling, thank you for the scan! https://sketchfab.com/3d-models/dress-form-73cb17f243f242e4aec48836eade1f9d

The rest was modeled by myself in fusion 360.