How to Sew the Baseball Stitch
"The baseball stitch is a useful, permanent stitch, because it is very flexible and very elastic. It pulls the edges of material (cloth or leather) evenly together to form a flat surface, and it is used for repair or closing an opening."
This is an excerpt from the Aircrew Survival Equipmentman 2 from Aviation Maintenance and Training Manuals found online. Who would have thought sewing was tied to aviation?