A while ago I did a first mockup of a Sture doublet using a bought pattern, and had epic fail. The length of the front and back pieces were different, the armscye was way too big for the sleeve (which many people blamed on my adding extra width to the sides to accommodate a beer belly as I felt had been done in the original), and there were niggles that I had with the overall look.

( The second muslin has fared better. )