Like many identical twins, Mary and Maura Zeiler, 22, were dressed in duplicate outfits through most of elementary school, which didn't seem so extraordinary at the time, says Maura, the younger by a couple of minutes. "But now I look back in horror."

The "twinning" of clothes for children has a practical as well as a visual effect because it makes for one choice, instead of two, and for easy interchanges in wardrobes.

Mary, an intern with the television show PM Magazine, and Maura, an intern with a congressional caucus, still twin their clothes by dipping into each other's closets, but now th-y mix wardrobes to extend their versatility.

Though their tastes are similar, Maura tilts to the classic and Mary injects updated clothes into the common wardrobe. Maura laughs: "Mary likes ankle strap shoes. I just couldn't imagine wearing them."

Because they share a lot of their clothes, it could be difficult to tell the Georgetown co-eds apart by looks or what they wear. But men seem to have less difficulty than women. "They quickly find mental or physical and emotional differences once they get to know us, and then confuse us much less often than women do," Maura says.

Twinning clothes has become the most sensible way to build a wardrobe for one as well as for two. The Zeiler twins show how -- for night and day. At far right, Mary wears a Calvin Klein burgundy wool gabardine suit with a print blouse. Maura shares the blouse, which she pairs with a matching skirt and could also team with the suit jacket.

For constructing several party looks this winter, Anthony Muto's pink satin quilted jacket is central. Right, Mary wears the warm jacket by itself with black pants. It works equally well over a black velvet strapless top and pants or, as Maura finds, over a black velvet sheath.