Let's face it: Submerged under all those official Washington "dress for success" exteriors are scores of secret dancers, yearning to put on glittery costumes and heavy eye makeup and wow the crowds. Yesterday's "Dance Fest '83," presented by the Downtown YWCA, the Joy of Motion Dance Center, Diane Floyd and the Saturday Company and the Metropolitan Dance Association, allowed an incredible variety of movers and shakers to do their thing in a most supportive and informal environment.

From 2 in the afternoon into the night, the Y was filled with all facets of dance activity. Video dances and dance films were screened in one area, while the lobby became an emporium in which leg warmers and leotards were hawked. A fine exhibit of dance photography by Dennis Deloria, Glen Sweetser, Michael Hauptschein, Ginevra Portlock and Robert Sugar recalled memories of performances and dancers who've pulled up stakes here.

During the time this writer strolled there, five companies--three in the gymnasium, two in Penney Auditorium--offered a wild array of styles and works. The six women who make up Baltimore's Movement Arts Parasol lurched and wafted in traditional-modern-dance "wave" fashion. Four young women from the Atrium Junior Dance Company, dressed in sequins, feathers and clinging Lycra, tapped up a storm. Rosetta Brooks of the St. Mark's Dance Company lunged and gestured dramatically in her "Start All Over Again." A trio of fringed and beaming lovelies from the Academy of Theatrical Arts minced and jutted their way to Liza Minnelli's brassy rendition of "City Lights." And yet another trio of seductresses, members of the McLean Mid East Dance Association, manipulated swags of filmy material, flitted their eyeballs back and forth, and wiggled every imaginable part of their anatomy during their "Veil Dance."