LUNCHEON SUITS take a mid- day break. Navy with white polka dot dress and jacket by Valentino, $1,350; black and white zebra-striped suit with sequin effect by Stizzoli, $973; jewelry by Ciner; all from Straiths. Hats and gloves from Eleanor Mack, Park Foyal. Photographed at Bean Around the Werld, West Vancouver; fashion coordination, Caro} Crenna. By Carol Crenna Contributing Writer DESIGNERS GO to lunch for inspiration this season. Luncheon suits are a popular trend for summer and early fall in Europe, and are worn for dinner engagements and after- five wear as well as for working lunches. Saluting a more sophisticated '70s era than many current styles, these suits are inspired by the well-dressed socialites of the decade, such as Jaqueline Onassis, and movie stars like Faye Dunaway, Can- dice Bergen, and Julie Christie. The two-piece luncheon suit, also called the little French suit, is at its prettiest in the 90s. Consisting of a cropped jacket and a straight skirt or sheath dress that reaches the knee, it is cut in graphic patterns in black and white or navy and white lightweight wool and fabric blends. The softly shaped jackets are single- breasted and boxy to allow them to fall freely to the hipbone. They have distinctive details: ornamen- tal buttons, or a short notched lapel. The workday lightens up with these chic suits fron Straiths, 900 West Georgia St., atthe Hotel Vancouver. Since they need no additional blouse or camisole beneath, they stay lightweight and comfortable for warm days, Exquisitely made luncheon suits by well-respected Parisian and Italian de- Signers are available at Straiths ino a rariety of fine fabrics. To recall an eather era, team them with white wrist gloves, a head seacr or a hat. Nothing could be more feminine. These suits are litters fo most figure types. Petite women will find the shortened jacket adds heivht. Larger worn will appreciate the equal portions of jacket and skirt that balanee their seight, The details of the jacket draw the eve upward, away from the hips, which meet the hem of the jacket.