You can purchase the head portions and the arms,legs... and you can purchase them painted or unpainted, and then you add the clothes and attatch all the bits. Usually the bodies are a soft padding and the legs and arms are stitched on..the heads may be glued, or sewn on, depends on the style..Pottery shops have them. Or look on line. You can make your own clay heads, arms, legs, but then you need a mold and away to fire them etc.
Small, child like ones are the ones I would really like to have information on, espacilly older style victorian age kinds. The ones mothers would have and let their little girls looks at but never play with for the fear of it getting broken.