Draping is a classic-Hollywood technique — indeed a classic Greek technique — that felt somewhat fresher here. Among those to display it was Naomi Watts, wearing a yellow strapless dress by Gucci with two striking accessories: a diamond Bulgari snake necklace, as if to ward off the backbiters of Sony, and the dramatically arching eyebrow of her husband, the actor Liev Schreiber. Though one might expect Amy Adams, front row at Gucci’s spring show in Milan, to also choose a gown from that house, she decided on draped periwinkle Versace instead. Jessica Chastain’s dress, a bronze variation of the gold-pleated William Travilla one that Marilyn Monroe wore in “Gentlemen Prefer Blondes,” was also by Versace.