Happened to me too. It bought size 12 pants about a month ago now. They were tight, to the point I dreaded wearing them (thought this would help me lose weight, they were $12 at OldNavy). Anyway, I have not lost anymore weight, but today, they fit. I don't know, maybe I stretched them out, but honestly, they were right out of the dry. I have jeans I have worn for years that don't go on as well. Also, I keep adding holes to my favorite belt.