My feet are shrinking.....
Over the years (I'm 55 now) I've added a half shoe size here, a half size there until I was up to a 9 1/2. After losing my weight I'm back to a size 8!! You'll find lots of body parts shrink (even the ones you don't want to - lol). At first I just bought the plastic ring sizers at Wal-Mart for a couple of bucks until I got to my weight goal. Then I took my rings in to a jewelers and had them resized.
You'll lose and find things through this whole process!! I found collar bones and back bones and hip bones that I haven't seen in years!! I found a chin and some jawbones that had been missing for quite awhile too! Of course I lost half of my girls along with 96 lbs of fat but I found a new me and a more confident and self-assured woman along the way!! Isn't it glorious!!