Yesterday I was watching some videos on youtube and ran into this sewing technique. The artists calls this a modern slashing technique. She took the idea from a Renaissance clothing technique of slashing a garment so that the cloth beneath shows. Her technique is a lot more freeform. She layers scraps of fabric between two solid layers of cloth and then sews lines and circles all over the piece. Then she slashes inside the sewing lines, exposing the under layers. Here are a couple of tutorials. Wish I had a working sewing machine!