Hand-embroidered, 500-thread-count Egyptian-cotton sheets from Yves Delorme (6651-A Old Dominion Dr., McLean, 703-356-3085; 10231 Old Georgetown Rd., Bethesda, 301-897-5009) are the ultimate in luxury—after all, the Parisian linen maker has been in business for 160 years and dresses the beds of such tony hotels as the Carlyle in Manhattan. Such bedtime bliss doesn’t come cheap: A queen-size duvet cover, flat and fitted sheets, and two standard pillowcases from the Palace Collection’s Etoile line run $1,530.