At one point I flang my Tilley hat into the water to verify that it would float. Although I had no doubt that it would, I was a little surprised at just how well it did. (I was expecting something more along the lines of being suspended at the surface, mostly underwater.) Here's a little closer view.
If you've never heard of a Tilley hat, and you're into adventuresome clothing at all, make haste to the Tilley home page. (Or call 1-800-ENDURES for a catalog.)