Where did all that weight g..

Last year I was in a state of depression and lost 20 lbs. Already a thin person at 5'6" and 125 lbs, I shrunk down to 105 lbs and looked ghastly. Over the past 8 months, I got myself back together and managed to get better. I'm healthy again, eating like I should be and gained all the weight back. I'm not complaining, but before I lost the weight my size 5 jeans were pretty tight and sometimes really hard to get on, lol. I shrunk down to a size 3, which were too big at times. But now, I can still wear my size 3's and my size 5's fit good now, but aren't skin tight like they were before my weight loss even though I'm exactly how I weighed before. I've noticed an increase in my breast size but not THAT much! I'm wondering where it went this time. Ideas? And no, it's not muscle, I haven't lifted any weights since then or exercised a whole bunch.

you are probably not eating right and this is just normal