Do serpentine belts shrink?

[crazypete]

I took off the accessory belt to swap my timing chain cover and get my mechanical fuel pump going. I took it off and threw it in the corner of the garage (it's pretty cold in there). Now, after all is said and done, it seems to be WAAAAAAAY too short. I mean it must have shrunk at least 5-7 in. A second belt that was waaaaay too big that I had up in my likewise freezing attic is also now just barely too small to fit. Am I losing my mind?

I pulled all the accessories off, sure, but they cant really be mounted wrong. I looked at a picture I took before and everything looks exactly the same. I have 150 lbs of freeweights dangling on the belt right now with a hairdryer on it. I dont really feel like blowing another $50 on yet another belt