Even the rail-thinnest fashion model couldn't starve her way into one of Helen Sandow's haute couture evening gowns.

DESIGNER DRESS: Helen Sandow holds one of her creations with its characteristic detail. NURI VALLBONA/HERALD STAFF

Adorned with Czech crystals, imported satins and glittering beadwork, her creations are custom-made to fit mannequins roughly the size of a thumb.

Sandow is a rising star in the world of dollhouse miniatures, where collectors clamor for tiny, meticulously crafted replicas of life-sized objects.

''My dresses are one of a kind,'' says Sandow, 56, who works out of the kitchen in her Palmetto Bay home.

And, unlike so many clothing manufacturers, she's no design thief.

''When I first started making the dresses, a friend brought me a book to get ideas from,'' she said. ``I haven't looked at it yet.''

In business just 15 months, Sandow has completed more than 250 tiny dresses, most of which are displayed on her website, miniature dresses.com, where buyers snap them up for about $50 each.

Fifteen of her costumes are featured in the Miniature Museum of Taiwan (the hobby is huge in Asia), and next year her creations will appear in the prestigious Chicago International Miniature Show, which draws hundreds of collectors and crafters from around the world.

Though Sandow has never taken a fashion design class, her diminutive duds fulfilled a lifetime ambition. ''As a frustrated dress designer, once I got started making these dresses, I found that I couldn't stop,'' she said.

Sandow, who has worked in graphic arts for 25 years, ventured into the world of miniatures in 1988 at a class at the now-closed Miniatures of Miami -- crafting mini foodstuffs like spaghetti (from thread) and turkey (from clay).

''It was incredible,'' she said. ``I mean, you could take a close-up picture of food I made and not even be able to tell the difference between it and life-sized, real food.''

Sandow made hundreds of pieces from Fimo, a polymer clay, and sought out classes in other aspects of miniature crafting. She considers herself lucky to have landed under the tutelage of Brooke Tucker, a Bremerton, Wash.-based teacher who leads workshops all over the world that attract year-long waiting lists. (A Tucker workshop has become Helen Sandow's annual wedding-anniversary gift from her husband, Leonard, owner of American Printing Arts.)

''Helen's work is spectacular,'' Tucker said in a telephone interview. ``Her imagination is superior to that of almost anyone else I know. It took me a while to recognize the amount of talent that she had, and as a teacher, to make myself step back and let her create.''

At a three-day workshop Tucker taught at the Cottage of Miniatures in Fort Myers, Sandow learned to make room-boxes -- tiny replicas of real rooms. Her class project -- an elegant storefront inspired by the Shops of Bal Harbour and New York's Fifth Avenue -- was her serendipitous path to small-scale designer gowns.

''I needed something to be in my storefront, on display in the window, just like in a real store,'' Sandow said. ``That's when I first came up with the idea of creating dresses and putting them on tiny mannequins. After that, I couldn't stop and I made more. People told me I should consider selling them and it took off from there.''

Sandow fashions her gowns at her kitchen table, peering intently through unsurprisingly thick glasses. She sells most of them online and at shows, but some are on view in the six room-boxes arranged in gilt-framed glass display cases embedded into her living room wall. The central display, ''Chez Helene,'' is the storefront that started it all.

Realistic to the last detail, the boxes are wired for electricity to illuminate their stained-glass lamps and chandeliers. The real eye-catcher is a dazzling fireworks backdrop for Chez Helene constructed of tiny fiber optics pushed through pinholes in a postcard.

It takes Sandow about three hours to create a gown. She uses lightweight fabrics (usually silks or satins) and ½-millimeter beads, sequins, and jewels, sealing seams and applying ornaments with a toothpick and a glue bottle that squeezes out drops the diameter of a strand of hair. As a finishing touch, she spritzes the gown with a few thin coatings of hair spray.

''Making miniatures is a very exacting art,'' she said. ``Neatness is essential. It definitely becomes an obsession. An obsession for perfection. Perfection is always my ultimate goal. I've seen miniatures where the glue is showing and the pieces aren't well constructed. I couldn't stand for that in my work.''

Sandow's sunny, spotless home is a testament to her fastidiousness. Her fabrics are carefully organized in storage bins, beads are sorted by color in tiny containers and the earrings from which she gets many of her minuscule jewels are carefully arrayed on a push pin.

''It's not uncommon for miniaturists to sew little costumes,'' says mentor Tucker. ``However . . . what she has done with the beadwork is ingenious.''

''I consider myself an artist,'' says Sandow said, holding a tiny mannequin in one hand. ``This is my canvas.''

Lifting her glue bottle, she continued: ``And this is my paintbrush. The dresses are my form of self-expression. More than anything else, I'd like to be recognized as a true designer.''