I visited the Kelsey Museum collection in the spring of 2016, went home and worked out the pattern for this hat, and then came back in the summer of 2017. At the occasion of my second visit, I took a photo of my replica beside the original. Actually I took two photos. In one of them, my replica is inside-out.
If anyone is interested, my website contains three tutorials that take you step-by-step, how to do this twining technique on a background of interlinking. And I do still have the specific pattern for these designs. Contact me at Carol at my website Sash Weaver dot com