The white blouses here might make you swear off plain oxford shirts forever. Rows of snowy tops, most in cotton poplin or organdy, are jazzed up with lacings, embroidery, or ruching. A perfect pick for the indecisive: a white buttondown that comes with four different detachable collars and three styles of cuffs, each of which buttons into place. Some shirts are executed in black. Subway: R, W to Prince St. Other location: 687 Madison Ave., between E. 62nd and E. 61st Sts., Upper East Side, PHONE: 212/688-4362; Subway: N, R, 4, 5, 6 to 59th St.