That is so wonderful! Sounds like you have made such great progress!!!
I too had a similar experience just yesterday with a dreaded pair of jeans that I had bought years ago and they must have been mislabled or something because they were my "size" but when I got them home they were so small I couldn't get them over my thighs. Well, as of yesterday they went on and even zipped! Mind you, they were still too tight to wear in public, but they are almost there!!!
Isn't that the most wonderful sense of pride, being able to put something on that you haven't worn in ages (or in my case ever) ? You are doing so great! Keep up the effort and the great work!!!