A/X's affordable basics make it possible for most people to own an Armani…something. T-shirts and dark-washed jeans abound, but there are also sharp zip-front jackets, pea coats, and stretchy knits. Subway: R, W to Prince St.; F, V to Broadway-Lafayette St. Other locations: 645 5th Ave., at E. 51st St., Midtown East, PHONE: 212/980-3037; Subway: B, D, F, V to 47th-50th St./Rockefeller Center. 129 5th Ave., between W. 19th and W. 20th Sts., Flatiron District, PHONE: 212/254-7230; Subway: R, W to 23rd St. 10 Columbus Circle, at W. 59th St., Midtown West, PHONE: 212/823-9321; Subway: 1, 9, A, C, B, D to Columbus Circle.