I feel that the answer to this is probably, "No, you just need to eat less", but I am actually curious about this.
I have just got out my spring/summer clothes which have been stored away for over 6 months, and a lot of them, especially those in cotton, are just that little bit small for me. I have noticed this before with clothes I haven't worn for a long period of time. They stretch out to my size again after wearing for a while, but is it actually a thing that clothes could shrink a little/weave get tighter/something else when stored away for a long time?