The country's best-performing mutual funds ramped up their appetite for apparel stocks ahead of the holidays. Leading funds have been adding apparel makers Chico's FAS (CHS), Gap (GPS) and Michael Kors (KORS). They've also shopped specialty stores, such as GNC Holdings (GNC) and Vitamin Shoppe (VSI), in their latest reporting periods. As a result of seeing higher spending at the mall, fund managers have been banking on credit card processors Visa