NEW YORK — ‘Tis the season to be married. And with a nod to a bygone era, bridal designers are showing gowns that radiate a certain Audrey Hepburn-like charm. Often they feature unexpected touches of bareness — they are off-the-shoulder, for example, or even strapless. Here, Reem Acra’s silk gowns. For more bridal, see pages 6 and 7.