"That one over there usually hangs over our bed," confided William Brubeck proudly, as he pointed to the stunning orange, red and brown Moroccan tapestry on one the walls of the Textile Museum last night. The museum was packed with more than 1,000 guests, who came to see the first major U.S. exhibition of Moroccan carpets and textiles.

Burbeck and his wife, Lois, an importer of Moroccan carpets, have collected Moroccan textiles for the past eight years. "We became interested in them while I was the American consul general in Casablanca," said Brubeck.

Black sables mixed with heavily beaded, jangly costumes as the guests goggled at the 100-piece exhibit. Even Brubeck confessed "I've never seen anything like it."

The American ambassador to Morocco, Angier Biddle Duke, and his wife Robin flew in especially for the occasion. Also on hand was the Moroccan ambassador to the United States, Ali Bengelloun, and his wife.

Commenting on the effect of the new administration, National Endowment for the Arts Chairman Livingston Biddle said, "The arts have really taken shape in the past years and the transition people I've worked with so far seem enthusiastic. I'm looking forward to working with the Reagan people."

Rep. G.V. (Sonny) Montgomery (D-Miss.) was not nearly so optimistic.

"I'm sure like everything else, the new administration is going to tighten up on the arts. I expect a lot of my own programs to get cut back."