And here's the witch's hat and broom to complete your Barbie's Halloween outfit.
The hat is made from thick imitation leather. If you don't have any, you can replace it with soft cardboard and cover it with black fabric. For the procedure, take inspiration from the fairy hat.
For the broom, I had a fairly long stick, but a simple stick might work better. And the straw can be replaced by paper cut into strips.
Happy sewing!