This goes to IESL next time I'm in Amherst. They acquired a teapot last semester, and I promised to knit them the nerdiest tea cozy I could think up. I would have put Student's t distribution on it, but I didn't think I could make it fit. I used super cheap Bernat acrylic. It's a tiny bit short for my teapot, but I can't remember how big the IESL one is.
Someone asked for the pattern. The cozy itself wasn't that great, but here's an excel version of the chart (the real one is scribbled on graph paper, and I don't have access to a scanner!)