(L-R) Frette, Isaac Mizrahi, Polo Ralph Lauren, Tory Burch, Brooks Brothers, and Steven Alan   (Photo: Hannah Whitaker/New York Magazine)

Men's: Cotton pajamas by Frette ($225; 799 Madison Ave., nr. 67th St.; 212-988-5221).

Women's: Flannel pajamas by Isaac Mizrahi ($64 by special order at 347-727-2474).

Men's: Cotton pajamas by Polo Ralph Lauren ($32.50 at Macy's, 151 W. 34th St., at Broadway; 212-695-4400).

Women's: Cotton pajamas by Tory Burch ($125; 257 Elizabeth St., nr. Houston St.; 212-334-3000).

Men's: Flannel pajamas by Brooks Brothers ($79.50; 346 Madison Ave., at 44th St.; 212-682-8800).

Women's: Pajama top, $135, and shorts, $69, by Steven Alan (103 Franklin St., nr. Church St.; 212-343-0692).