Reprinted from yesterday's late editions.

The Ambassador of Japan and Mrs. Fumihiko Togo gave themselves a rather splendid housewarming Thursday night, inviting 245 of Washington's so-called smart set to see their new digs of institutional proportions.

For after-dinner entertainment, Japan's frontrunner couture designer, Hanae Mori, brought her collection fom New York. Mori designs are made and shown in Paris, Tokyo and Nebraska Avenue embassay.

Mrs. Togo, who frequently wears Mori couture, chose to wear one Thursday, whose embroidered fabric took 40 days to hand-apply, according to the designer. The hostess led off a faithful band of Mori fans, some who wore them to the black-tie sit-down dinner and some who left them at home because of the stormy evening.

The occasion officially unveiled the steel-and-concrete residence which sprawls over 1.6 acres of floor space in a setting of more than seven acres. Guests only saw part of the structure, however. Besides the two stories risking in the air, there also are two stories underground.

Begun in 1974 and completed last March, the residence was the architectural creation of the late Isoya Yoshida. The size ofit stunned some of the guests, who quietly viewed it as somewhat of an anachronism in today's energy-conscious world.

But as one guest reminded another, "When you're an embass, you don't concern yourself with such mundane things."

Models made their dramatic entrances down a staircase often with billowy stoles trailing behind. Everything was for late afternoon or evening and those which borrowed traditional Far Eastern shapes and hand-screened patterns were applauded most.

Assistant Serectary of State Patsy Mink was eyeing a burgundy chiffon style to take on her official trip to Fiji, but was discouraged by the $500to $1000 plus price tag . . .

Price tags, in fact, were on the minds of a number in the crowd, among them Mrs. Potter Stewart. "When I first saw a $1,2000-dress advertised in the newspaper I almost couldn't believe it. It was there on the same page as stories about poverty . . ."