I just finished walking and was thinking that I needed to go grocery shopping, but I'd have to do laundry first since my jeans are dirty. Then it hit me.

I don't have to do laundry. The jeans hanging out in my drawer aren't too small for me. They fit now.
I experienced something similar earlier this week. I've cleared the too-large clothing out of my closet. I bought a lot of things on sale over the past few years for "when I lose weight", and they've been hanging since then. I was looking for something to wear to work, and I wasn't sure why there weren't any shirts that would fit. Similar epiphany moment--those clothes *do* fit, so quit being weird.
I can see that I'm smaller than I was, so it's not body dysmorphia. It's just an adjustment to be wearing the clothes that were "someday" and realizing that someday is now.