Simone Rocha took youth — real and imaginary, gilded and not — as inspiration for fall with a show at the hilltop Victorian-era Alexandra Palace with its sweeping views of London, and beyond.

The show traveled through time and space, pinging between immortal characters from Celtic mythology to the poor Pony Kids of ’90s Dublin who made money selling animals, to the eccentric sisters of William Butler Yeats, who were star players in the Irish Arts and Crafts movements.

Although the references were many, the collection was uncomplicated and also served as the launchpad for the designer’s debut collaboration with Adidas.

“It feels so natural to me. I was a teenager wearing Adidas running shorts under vintage tutus. The brand has always felt very ‘there,’” Rocha said.

“I’ve been given wonderful creative freedom, and have even been able to reengineer the logo in a way,” said the designer, who worked the recognizable red stripes onto long, romantic dresses, ballet slipper-sneaker hybrids and sporty A-line jackets.

That youthful irreverence informed the whole collection, with Rocha blending the dreamy and the sturdy, fantasy and reality to great effect.

She added sparkling, crystal embellishment to the pockets of chunky shearlings or to the lapels of tailored suits; paired lacy dresses with gray wool coats, and pinned colorful ribbons to woolly knee socks or to the fronts of dark shirts and suits.

As the models worked their way down the stripped wooden floorboards of the vast unpolished space, those contrasts just kept coming.

A chocolate brown military-style coat came with a full skirt and a hint of Victoriana, while A-line track jackets with stripes were layered over tiers of white or black tulle.

A long, white ruffly dress was ready for sports day with jaunty red stripes on the shoulders, while a track jacket with statement pouf sleeves might just work for prom night at the school gym.

When Rocha wasn’t playing a game of contrasts, she was focusing on color, working with a dark palette of earth tones: moss for a gown with an oversize bow below the waist; ruby for a curvy sequin-covered dress and matching round cap, and olive for shearling-lined aviator jackets, zip-front skirts and lacy tops.

It was statement dressing with a practical edge for old and young alike.