It's going to be a while before my next formal class, but sometimes a teaching opportunity just comes along.
The overdress I've been wearing for [mumble] years is based on pictures in the Maciejowski Bible. It has convertible sleeves, which may be worn on the arm or off, as the weather changes. All I've had for a pattern was the picture, but I managed to get a very functional garment by simply not sewing up the front of the sleeves. (I think I can do better, but this one works well, and looks like the pictures.)
At a recent event, I was asked about the dress by a lady who'd pretty well managed the headwear. We exchanged notes, so watch for another 13th-century Northshielder in a convertible gown.