Sarah Wachter fed a pair of silky pants through her electric sewing machine. The seam of the crotch had been ripped out and needed restitching. "It's a quick little repair. It is just a question of knowing how to handle the fabric and what it needs," Wachter said. A few seconds later, the pants are re-stitched and ready for wearing. Most days, Wachter creates bags for her small business. But on a recent Sunday, she offered mending services at a clothing swap and repair fair.