This is a strange side effect of my weight loss so far. I have a necklace that I wear so regularly that I often don't pay much attention to it. Today however when I put it on I noticed that it hung all the way down under the collar of my shirt whereas previously it used to land at colar bone level.
I never took a measurement of my neck but apparently even that is shrinking.
Yes, it has been said if you track measurements you should track your neck too. I know I have lost 1/2 from my neck. Good for you! It is fun to learn where all our weight distributes itself. My shoes are looser because I have lost weight in my feet!