Basic sewing patterns for barbie dolls (original size). If you want, add for example pleats, fastenings and slits for better fit.
You can also add decorative beads, buttons, frill, lace, bow, pocket…I recomend an elastic fabrics. Cut the fabric with a 5 mm overlap.
Printing from PLA, without supports, layer height 0.2 mm. Adjust the height as you need.

Clothes hangers, which you can find in my Printables portfolio:
https://www.printables.com/cs/model/586312-doll-clothes-hanger
and
https://www.printables.com/cs/model/586175-spruttig-hanger-in-doll-size
The author marked this model as their own original creation.