Sounds like me when I was in college. At first clothes just didn't fit well. Weight gain did eventually come, but probably not until sophomore or junior year. I've lost it and put it back on a few times since then (grad school was the worst...I gained 40 pounds in about 3 years). I let stressful things get to me.I am a pear shape as well and I can fit into shirts from middle school (I'm a sophomore in college). This last semester was crazy stressful and busy so I was eating tons of unhealthy food and didn't go to the gym. I haven't actually gained too much weight, I just find my pants and skirts not looking extremely flattering.
If I still had shirts from junior high, though, I think they'd be falling apart from age...
So anyway, one way I deal with stress is eating (eating too much, eating junk, etc.). Another one is stopping exercising. The third one is buying stuff. At different points in my life, it's been different stuff. For a long while, it was craft supplies -- went through a fabric stage, a bead stage, a yarn stage, etc. Then it was animals (I had SOOOOO many pets at one point -- like 28 birds and 2 rats and 4 hamsters and a guinea pig and an iguana and a tortoise and a dog and 5 cats and 4 aquariums). I had a houseplant stage as well (and a lot of orchids and African violets and all of the various meters and types of potting material and fertilizer that went along with them). I've gone on novel-buying binges before, too, and once I went a little nuts ordering different types of tea and whole grain flour. Oh, and shoes and handbags. Lately it's been beauty products, hence my participation in this thread.