Mennonites in the Mall

It always makes me look twice when I spot a Mennonite at the mall. It just seems so incongruous - their traditional dress and covered hair, and the blatant commercialism of the mall. How do they reconcile these things? How can they make their own traditional clothes and live in fairly sheltered communities, yet use cell phones and drive Suburbans? My favorite sighting was back in Oregon - when the 22 yo Mennonite girl pulled up to Goodwill in her white BMW sedan and dropped off a donation. Weirdness.