Here are your culprits. Your weight may remain the same, but where it is changes with the work you're doing. Specifically, what it looks like is that you've added mass along the shoulder and upper chest. Trust me, it doesn't take a lot. Chris ended up having to completely recut the sleeves on my first suit because I had started playing racquetball. My weight there had actually gone down, but there was added tone and bulk in the chest and shoulder.