I bought a Stetson Nostalgia last November. I was still new to hats, so I inadvertently bought it one size too large, 7 1/2. I was bummed when I got it, since it was too big, but I filled the sweatband with the usual stuff and got it to fit all right. I liked the hat a lot, every other way. I wore it as my every day hat at work. In January I decided to see how tough it was so I wore it in a rain storm and got it soaked, big time. Lo and behold, after the soaking, it fit perfectly. I was delighted. Now as I wear it in summer weather on hikes, etc, it is getting a bit tight. I have seen the hat stretchers for sale and always wondered why there was a market for them, but now I'm starting to understand that some hats need to be kept in size. Now I'm also beginning to understand why so many vintage hats are smaller than their listed size...they shrunk over time. My Akubra Fed IV in Imperial grade has done the same thing over the last year. It has shrunk a whole size. At what point do they stop shrinking? A year? Two? Many?