SIMPLY JILLIONS of chic (but hot) folks gathered, very nearly navel to navel in the Georgetown N Street house and garden of John Sherman and Lorraine Cooper Thursday night.

Lorraine, member of the Best Dressed Hall of Fame, in designer navy and white, welcomed and waved a palmetto fan at the same time, something every hostess is bound to copy.

Former Massachusetts Sen. Ed Brooke, looking as though he'd never even heard of former wife or daughters, was with his gorgeous dish of a new wife, about whom Ambassador Sol Linowitz had said in hushed and reverent tones . . . "My god, I hear she's not even out of her 20s yet!"

In the dense throng of Cooper Friends, it was all but impossible to identify, much less find, the honored senatoors without a program and a map!

Chief Justice Warren Burger was really boring in on Nancy Dickerson with a long, learned tale. At the same table were Vera Burger, Nancy Thurmond and Sen. Strom, deep in his strawberries and cream.

Two more table twosomes that stood out: Justice Powell/Griffin Bell . . . Robert F. McNamara/Richard Helms . . . right on the edge of the dance floor and couldn't have heard each other scream over the din of the band, the hoofers, talking and laughing and the clank of silver on china.

All guests were greeted by the two Cooper tiny dogs, Robin and Chillene, who stood snootily at the door putting a canine lorgnette on all who entered.

The Dowager Queen herself, the legendary Gwen Cafritz, came out for the party given for Rose Saul Zalles at the 1925 F Street Club by Adm. Tom and Virginia Kelly.

Queen Gwen still commands royal respect. She was gowned in white moire taffeta touched with black velvet, that famous cloud of black hair perfectly coiffed, rare chincilla on her arm.

She does not suffer being touched or made over too, too much . . . it's best to bob your curtsy with dispatch and back away.

The Thursday night affair drew the embassy crowd en masse, but also Society, old young and in-between as well as summer visitors from Middleburg.

Rose Zalles' flowing white silk gown was splashed with huge cyclamen roses and she wore some of her "heroic jewelry" - an enormous topaz, jade pieces of white and gold set in jewels on long gold chains, and fantastic drop emerald earrings.

Thursday was an evening of splendid dresses but just everyday utilitarian jewels from start to finish. No one had really gone to the bank vault and taken out the Crown Jewels. One can only surmise that with the June Hot and Humids comes the decision not to sweat up the Big Rocks! It only makes sense.

The garden out back of Decatur House was unfortunately tented, Keeping out the cool breeze, as Washington, Detroit and Media Biggies gathered 'round the food as guests of WETA and Ford Motor Co.

Across Lafayette Square from Decatur House were sights and sounds which defy description, as seeming hundreds of huge diesel tractor trailer trucks encircled the White House, blasting their air horns in an endless renting of the evening air, registering their owners' rage at the diesel fuel shortage.

The occasion was the joining in sporsorship of Washington Week in Review and Ford to continue the most widely seen public affairs program in public broadcasting. Greg Schneiders, of Gerald Rafshoon's White House PR Miracle-Workers-and-Knowers-of-All-T hings, drew a total blank when asked what he thought of the truck siege of the White House. "I didn't know anything like that was planned," he said.

Some heretofore unprinted gems from the Washington Emmy Awards ceremony last Saturday . . .

Susan Goldwater's short, sweet, magnificently unanimated career in TV was memorialized with a "Special Award for Dedication and Longevity in a TV Career" . . . referring, of course, to her recent advantageous marital arrangement with richie U.S. Ambassador Marvin Warner . . .

Low, losing mutterings in the WRC-NBC camp exploded when WJLA's "It's Elementary" won its award. Overheard was: " . . . I don't believe it . . . that program STINKS . . . do you hear me? . . . it it should be called 'It's s - y'." What People Are Saying:JOSEPH McCAFFREY . . . being honored in the Speaker's Dining Room, House side, for his 35 years covering Congress . . . "The saddest day I ever covered was when the Puerto Rican terrorists shot up the House chamber from the gallery leaving seven members wounded and bleeding . . . and the funniest day had to be when Massachusetts Rep. Foster Furcolo wrestled endlessly up and down the aisle with a member who had been too long in the Cloakroom snakebite kit . . ."

JACK VALENTI . . . at the publisher's do for best selling author David Halberstam . . . when asked about his trip to the Cannes Film Festival as American Movie Mogul . . . "It IS a zoo . . . yes, a real zoo . . . the Crazies do anything to get their pictures taken. I looked out my hotel window and there on the beach, stark naked, were two starlet types, cavorting, dancing, leaping, running back and forth, with a big crowd and the cameras grinding away. There are always some nuts there, who will do anything to be noticed, but it IS, even with all that, a great market for films. There were over 400 screening rooms, and different countries buy and trade each other's films. The American filmmakers do well at Cannes, because we're making good movies now." CAPTION: Picture 1, Former Sen. Edward Brooke and wife Anne at the Cooper party, photo by Joe Heiberger - The Washington Post; Picture 2, Sen. Strom Thurmond and wife Nancy at the Cooper party, photo by Joe Heiberger - The Washington Post