Francisco Costa, the Brazilian-born creative director of Calvin Klein Collection, was all boyish grins—he somehow manages to make dental braces look cool—after his fall 2008 collection debuted yesterday evening. As soon as all the attendees had taken their places in an I.C.U.-clean, boxy space at 205 West 39th St., sounds of approaching footsteps and solitary piano notes entered the room through mounted speakers—a kind of sensual contrast to Mr. Costa’s pragmatic pieces and warm demeanor.  read more »