It's the teapot cosy from issue 57 of "Sew" magazine.
It says to use the same pattern piece for the outer fabric (they suggested cotton) and the lining, fleece recommended. My only issue with this was that once sewn together the fleece was a little bit on the bulky side compared to the outer fabric. If I was to make another I'd scale the pattern down by a small amount for the fleece and see how that works. It still fits well over the teapot.
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