When my mom taught me to sew, we often would do French Felt seams. I always wondered why the people of France would want to feel a seam. A couple years ago my niece asked if I could find a you tube video on how to do this (we couldn't meet in person). When I couldn't find anything I eventually discovered I heard my mom wrong and it was a FELLED seam. Only took 50+ years to figure this one out.