Hourglass After One Month

It's been so fun checking back here to see what lovely sweaters everyone has made!

I have a random Q: I made the smallest size of the hourglass, and when I finished it, it seemed to fit. It was a little looser after blocking, but now it's gotten incredibly stretched out. I rewashed and reblocked, but I just can't seem to get it back to a size that fits. It's not me that's gotten smaller, it's the sweater that's gotten bigger.

Any advice for shrinking it a bit without ruining the sweater? I used Cash Iroha, if that's at all helpful.