Lady Gaga displays an outfit during New York Fashion Week.

Lady Gaga powered down the runway for design legend Marc Jacobs in a triumphant finale to New York Fashion Week, showcasing a Gothic fantasy of oversized coats, full skirts and teetering platforms.

Jacobs prides himself on closing out the biannual Big Apple fashion bonanza by putting on extravagant spectaculars — and his fall/winter collection was no exception.

He turned the Park Avenue Armory into a circular catwalk bathed in white, providing a dramatic backdrop to his meditation on black and all things Gothic, accentuated by incredible lace-up platform boots.

Lady Gaga walked the show with professional models just days after donning a Jacobs costume in her flamboyant tribute performance to the late David Bowie at the Grammy Awards in Los Angeles on Monday.

The pop diva wore a pale green blouse with a giant, oversized black coat with huge fur patches on the sleeves. Her blonde hair was crimped in rigid waves.

Actress Maggie Gyllenhaal was among the stars sitting in the front row. Vogue editor in chief Anna Wintour was photographed wearing a custom-made Jacobs tee-shirt in support of presidential candidate Hillary Clinton.

The designer shored up his reputation as the most cutting edge, daring fashion mind in contemporary America, offering up a loose, oversized look of baggy pants, full skirts and lace detail at the neck.

It was a dark and brooding show, emphasized by heavy black eye makeup and fur accessories in the look that kept the slender form of his girls almost hidden in the giant clothes.

His models sported checks and there was a luxurious chessboard train, as well as plastic-looking black skirts with lace-effect cut out, and frayed hems. Splashes of purple came on small bags and his towering boots.

Ralph Lauren, the last word in wearable preppy chic, kicked off the day poles apart from Jacobs with a collection blending country gentleman and cowboy dandy styles, crowned by liquid gold evening wear.

British actress Sienna Miller was guest of honor, dressed in black, seated next to Wintour and Lauren’s family. Lauren made extensive use of plaid and checks with signature suiting that included loose-cut pants, blazers and trench coats finished off with men’s ties at the throat — a meditation in taupe, truffle and mocha.

The suiting was lightened when styled with delicate cashmere knits, pleated silk crepe pants and silk shirts.

Lauren’s evening wear had its roots in a Victorian-era elegance, with frothy high-lace collars and black velvet, and a Prussian pigment printed coat that looked like a Romantic-era smoking jacket.

There was a stunning black velvet evening dress finished with oversized pleated white cuffs and a white ruffle at the neck worn by supermodel Karlie Kloss.

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