London—Stella McCartney and LeMieux are proud to announce the launch of a new equestrian collaboration—a conscious collection that unites the worlds of luxury fashion and technical performance wear. Rooted in shared values of innovation and a deep love of horses, this partnership marks a first-of-its-kind between the sustainable vision of McCartney and the technical mastery of LeMieux.

Stella x LM Base Layer and Pull-On Breeches in Lipstick Red. Courtesy LeMieux

“Horses have been part of my story since before I was born, and they still bring me joy every single day. Working with LeMieux felt completely natural—a way to unite my love of riding with my commitment to conscious, innovative design,” McCartney said. “This collection showcases sustainability in a modern, vegan and cruelty-free approach to equestrian wear and was created with the same integrity and attention to detail I bring to every part of my brand.”

Dan Mahoney, CEO of LeMieux, notes that the collaboration presents a new chapter for the company as they fuse LeMieux’s equestrian heritage with McCartney’s iconic approach to style.

“We’ve worked hand in hand to create something that’s both deeply authentic to the riding community and beautifully progressive in its sustainable vision,” he said. “It’s a collection that honors horses, nature and the people who ride with purpose.”

About the Collection

The collection was inspired by the bond between human, horse and the natural world. Designed in two timeless tones—Midnight Navy and Lipstick Red—the range celebrates elegance in motion through refined, performance-led silhouettes. Inspired by McCartney’s Miracle Dress, the base layer is shaped with flattering lines that contour the body and elevate technical wear. Crafted from moisture-wicking UV50+ recycled nylon, the piece features four-way stretch for ease of movement, breathable mesh panelling and sleeves with ribbed cuffs.

The Stella x LM Base Layer was inspired by Stella McCartney’s Miracle Dress and features flattering lines that contour to the body. Courtesy LeMieux

The pull-on breeches are sculpting, high-waisted and consciously made. Designed for both comfort and performance, the pair are designed with mesh side panels, a subtle silicone knee grip for stability and practical phone pockets.

Stella x LM Base Layer and Pull-On Breeches in Midnight Navy. Courtesy LeMieux

The fly hood is crocheted in organic cotton, ensuring a close, low-profile fit under the bridle. Ears in four-way stretch elastane protect the horse from irritation, while bound edges with soft ribbed cord piping further ensure comfort.

The saddle pad comes in both a dressage and classic jump square, both crafted with a 100% recycled fabric shell in an exclusive S-Wave quilt pattern. The pad features a natural bamboo and viscose-blend lining that’s kind to the horse’s coat, as well as a vegan leather girth protection area with a dual-branded embroidered strap. Bound edges with soft ribbed cord piping unify the edit’s minimal, sporty aesthetic.

Stella x LM Jump Square Saddle Pad in Lipstick Red; also available in Dressage. Courtesy LeMieux

You can view the full collection here.

About Stella McCartney

Stella McCartney is a luxury lifestyle brand that was launched under the designer’s name in 2001. It emboldens confident femininity with elevated yet effortless, conscious fashion. The brand is committed to being an ethical and modern company, believing it is responsible for the resources it uses and the impact it has on the environment. It is therefore constantly innovating new ways to become more sustainable, from designing to store practices and product manufacturing.

As a lifelong vegetarian, Stella McCartney never uses any leather, feathers, fur or skins in any products for both ethical and environmental reasons—pioneering a movement for the use of alternative materials. Supporting regenerative agriculture and circularity, the brand is embracing new business models that will transform how clothes are sourced, produced, sold, shared, repaired and reused, promoting long-lasting products with extended use to reduce environmental impact.

Today, Stella McCartney spans women’s ready to wear, unisex capsules, kids’ clothing, accessories, a performance wear collaboration with adidas and more—with 36 directly owned boutiques and 11 franchise stores in global cities including New York City, London, Paris, Milan and Tokyo. Our collections are now sold in 71 nations through 651 specialty shops and department stores, and ship to 47 countries via online. Learn more here.

About LeMeiux

LeMieux was founded by former Olympic eventer Robert LeMieux and his wife Lisa in 2006. Since then, LeMieux has been dedicated to providing the highest quality equestrian products at an affordable price, defined by unparalleled technical expertise. Globally recognized for its stunning seasonal collections of unique, compelling color-match stories as well as outstanding technical saddle pads, horse wear and blankets. Used by professional riders at the highest level of the sport, and leisure riders alike, LeMieux strive for every product to be defined by exceptional technical benefits, with a focus on style at the forefront of all design.With products sold in 90 countries, a brand that has equestrian at its heart, with products made for riders by riders, LeMieux has also expanded into toys, leisurewear and casual clothing, and has a range of footwear. Learn more here.