I am having a great time adapting patterns for Free Spirit. She is 11 to 12 inches tall, and turns out to be a good size for many of the patterns designed for the Fibre Craft 13 inch and 15 inch dolls. The great thing about crochet is that you can fit as you go, so if you need to remove a row or two in the bodice, or nip the waist in a couple stitches, it is very easy to do this as you are crocheting.
For the outfit above, in addition to using a size E hook and Red Heart Soft worsted yarn, I took in four stitches at the waistline, and removed two rows from the skirt. Sleeves and neck did not need to be altered. It fits Minerva very nicely :-) This was a pattern designed for the 13 inch Fibre Craft doll.
For this American Indian costume, I removed two rows from the bodice, and two rows from the skirt. I used a size E hook and Caron Simply Soft. This costume was designed for the 15 inch Fibre Craft doll. So what I notice is, the 13 inch doll bodice needs to be reduced in the waist, and the 15 inch doll bodice needs to be shortened slightly.
I crocheted these outfits very tightly; the gauge was six sc to one inch. I think they could be made in sport weight and a slighly looser grip on the hook with the same alterations.
Free patterns are available, and there are also out-of-print patterns available from Amazon, and from this site:
Enjoy the crochet!