What makes a quilt soft, gives a jacket its shape or adds cushioning to furniture often goes unnoticed. But for generations of people who sew, one name has been hard to miss: Pellon, recently acquired by a Tampa Bay investment group that scooped the 75-year-old textile brand and plans to expand its reach beyond the sheer sewing aisle. PCP Ventures LLC acquired Pellon Oct. 1 through a bankruptcy…