Protocol chief Evan Dobelle a man who respects tradition, followed an old one when he gave up his striped tie to Prince Charles, who admired it during the Silver Jubilee celebration this fall.

He has since acquired one for himself the same way. While at a meeting on the Panama Canal. Dobelle admired a tie, printed with the phone number of the White House, worn by Bahaman ambassador William Schwartz. "Now that I'm an ambassador," Dobelle told Schwartz. "I understand that if someone admires a tie you give it to him," and Schqartz complied.

Another wearer of the tie is Frank Moore, assistant to the President for Congressional liason, who got his from Cyrus Vance's sister-in-law Jean Vance. Moore says he wears it a lot "because it goes with a lot of my clothes" and that it attracts a lot of attention on the Hill.

Leo Cerruti of Cerruti ties (no relation to Nino Cerruti, the menswear designer) had no specific intent in mind when he created the silk tie six months ago, "any more than ties created before with my number or someone elses." But the tie debuted just at the moment Carter was calling for telephone questions on issues during a television program. Suddenly sales of the tie "took off," according to Cerruti, and he has sold 100 dozen to date.

Last spring, delicate embroidered hankies and napkins were integrated as collars and pockets and other details giving a fragile look to clothes. That same sort of hankies is now being used for a collection of intimate apparel called Hanky Panky, all one-of-a king designs, at Lord & Taylor (Chevy Chase).

Is it sex discrimination when a store charges to alter women's clothing but provides virtually the same service for men free? That's the charge in a complaint against Bloomingdale's filed by Eva DePonceau on October 4 after she had been told that shortening the sleeves on a blazer would cost $12.50. "The general party line here," says a Bloomingdale's spokesman, "is that we are not discriminating, but it would be inappropriate to comment further." There was also no comment from serveral areas stores contacted.

What to wear at home or to parties over the holidays? If two Washington parties are any example, the way to go is with a big taffeta skirt and soft blouse. It was true at the party Joy and Bruce Sundlun gave French designer Emanuel Ungaro and his director Bettina in their Georgetown house and it was true at the Symphony Ball. The full skirt and top, not always a new design, look far fresher than the expected Washington dress of chiffon or matte jersey.

The way the designers showed their clothes for spring in New York and Paris recently, it looks like diamonds and rubies and luxury jewels won't get much of an airing this spring. There was remarkably little jewelry shown, except the hair designs at Scott Barrie, the bangle bracelets at several designers and the ethnic necklaces at Yves Saint Laurent. At Geoffrey Beene and elsewhere, jewelry was replaced by silk flowers strung on a long silk cord.

Tips from the supplement called Nedelya, to the Russian government newspaper lzvestia: for hair styles for women, try curls on the top of the head, straight hair on the sides. A golden shade of hair is preferable, but natural colors are fashionable. For men, short hair has been in, but now hair can be longer on the top of the head. Long sideburns ar compeltely out.

For beauty care, women are advised to apply masks of face cream for 20 minutes a day, wash their faces five or six times in rapid succession, first with hot water, then with cold - without soap. They should lie down for half an hour before guests come.

If a woman cannot afford a new dress for a party, they suggest that she add a scarf or change buttons for a fresh look. And don't go to the theater or another person's house in extravagant clothes, warns the supplement: otherwise others will pay too much attention to you.

Some of the best fashion art around has started to show up in the ads for local discounts T. H. Mandy. It's the work of Antonio, top New York fashion illustrator, who is also a designer himself. Antonio, who in the past has done illustrations for Women's Wear Daily Saks Bloomingdale's and the telephone company, was a Puerto Rican street kid in New York whose extraordinary talents related to fashion have shown up not only in his drawings, not long ago exhibited at the Fashion Institute of Technology in New York, but as well is pieces of clothing picked up by Fiorruci. One fashion critic in New York calls Antonio and his pal Juan Ramos the "most important entrepreneurs of ideas" in the fashion business.

Diana Vreeland has picked up 750 yards of Bloomcraft's floral and stripe documentary design in Dacron and cotton called Connoisseur to use as a backdrop for a display of 19th-century lingerie in the Metropolitan Museum's Costume Institute's Vanity Fair exhibition, which opens this week. If the pattern's familiar, it's because it has been a top seller as a bedspread at Woodies and elsewhere. Vanity Fair is the sixth exhibition organized and selected by Diana Vreeland, special consultant to The Costume Institute since 1972 Vreeland sees it as a kind of bazaar of fantastic luxurious clothing, follies and fripperies, reflecting the vanities of men and women from many periods and places. The items exhibited and Vreeland's choice from the Costume Institute's collection of more than 30,000 articles of clothing, accessories and ornaments and most of them have never been shown publicly before it opens to the public on Thursday, Dec. 15, and will remain on view through Labor Day, 1979.