MILAN — Picking up where “Almost Famous” left off, Domenico Dolce and Stefano Gabbana served up a D&G collection replete with reconstructed concert T-shirts and hard-rocking gear right out of the early Eighties that every uber-groupie is sure to love. And with “Rock Star,” featuring Mark Wahlberg as a metal god opposite Jennifer Aniston, due out this fall, their timing couldn’t be better. Here, their acid-washed jeans and graphic top. For more on the shows, see pages 6 and 7.