This doll (fully clothed, with a tatty wig) was purchased at a Dollarama dollar store. According to the box, it is a 6" tall collectable porcelain doll and was made in China for Dollarama.
The box suggests that the doll is not suitable for children up to eight years old, but I would tend to discount that. It is made in five pieces (Head and body form one) and strung together with elastic. Under the cardboard in the photo is a crown opening, so it would be a simple matter to restring the doll with something more period. (Hemp twine that the craft stores sell for bracelets?)
I have heard of period porcelain dolls, and of jointed wooden dolls, and even a Greek jointed terracotta doll, but I am no expert. I would appeciate it if somebody could suggest whether or not this doll would be a reasonable fit with the current middle ages in general, or more specifically with the fifteenth century in England.