I have used 5 days worthy holiday by sewing 2 pants. Both the materials are highly elastic one is very thin. I sew this as legein with full round elastic and the other one is thicker stretchable material I sew this as semi-formal pant with backside elastic and front side splits. This process took a long time to study how to sew stretchable material the needle requirements, thread tension, stitch style etc. Very good experience and gained some knowledge. Happy to share with IL members.