I’ve made a bushel and a peck of these. Well, not quite. But if you click on the thumbnail gallery at the end of this post you’ll see almost all of them. This one is knitted in Big Mexiko Color by Schoeller-Stahl. It’s a self-patterning wool worsted weight. I had my doubts about my choice of this yarn because of the short row shaping and how it might interact with the dye pattern. But I am quite pleased with the result. The vintage button works well too.
Calorimetry is a free pattern available at Knitty’s Winter, 2006 edition (also via a Ravelry link). It’s designed by Kathryn Schoendorf. So far, it’s been knitted and posted on the project pages of 14696 Ravelers. Quite remarkable popularity, Kathryn!