My new (to me) Singer 15-91 handles silk charmuse beautifully. Just look at piping! Not a pucker to be seen. Have 13 yards of this stuff to make, so am absolutely relieved the machine is handling the silk so well. This is on the straight grain, so a bit of an easy test. Bias will be the real test.But so far so good!#sewing #VintageSewingMacine #HistoricalCostuming