UNION CITY, N.J. — On a hot summer day, Stefani Perada took a break from her job in West New York, N.J., and stepped outside in her long jilbab, the flowing clothes clothes worn by many Muslim women. Meanwhile, other Latinas in the mostly Hispanic neighborhood were taking advantage of the warm day, walking around in shorts and midriff-exposing halter tops. Perada, 19, who converted to Islam just over a year ago, is still trying to become acclimated to certain customs, such as the jilbab and the hijab, which covers her head and hair.