Welcome to the forum edith!!!
I saw something about this on television about three years ago. The surgeon cracked the inner portion of the hip on both sides, and then removed a portion of the bone. He then reassembled the hip to make it smaller in size.
This is a very non conventional surgery. I do not know anyone who has had it done, nor do I have any additional information.
For a smaller waist you can remove ribs. I have never heard of anyone getting shoulder surgery to make their frame smaller.