Here is a video tutorial of how I've made Kokoshnik - a Russian style headpiece (tiara or crown). It is entirely up to you how you will finish the piece. I have just demonstrated the way I wanted it to be. There are different techniques to Kokoshnik, for instance, some human size Kokoshniks are decorated in kanzashi technique (folded ribbon). Just let your creativity roll. Enjoy!
Here is the link below to the Kokoshnik pattern. You can adjust the pattern to your doll's head. The current size is for Ya MSD doll (ResinSoul).
MSD Size Kokoshnik pattern click me