I bought some size 13 pants a few months back since they were on sale. I tried them on when I got them and they were way, way, WAY too small. I couldn't even get them zipped.
Today, the pair of jeans that I really like were still in the dryer and I had to leave, and the 13's were the only ones clean. So I tried them on (why not?) and they closed and zipped! They were still a bit snug, but skinny jeans are almost always snug the first few times you wear them, anyway.
Also, I've been noticing my size 15 jeans falling off a lot. I started at 17, I think I'm gonna try them on for kicks and giggles.
Whoooo!