Brands / Significant Other / Clothing / Swimwear / Significant Other Rian OnePiece Swimsuit

Significant Other Rian OnePiece Swimsuit

Name: Significant Other Rian OnePiece Swimsuit
Brand: Significant Other
SKU: SW26144M-BLACK
Price: 250.00 USD
Availability: InStock

Significant Other

$250.00

Shop Now

Product Insights & Style Tips

The Significant Other Rian OnePiece Swimsuit feels like a quiet statement in black, a silhouette that moves with the body rather than fighting it. A one-shoulder line keeps the look modern, while ruched detailing across the bust lends soft structure and contour. A diagonal keyhole slit runs from the shoulder to the center chest, slicing the clean profile with a sharp, architectural touch. It reads sleek, confident, and instantly elevating for poolside or coastal days.

On the body the line hugs just enough to glide over curves without pinching, with ruching that holds shape as you move. The diagonal keyhole slip offers a hint of skin while staying secure enough for active moments and long, sun-drenched hours. It layers easily over a sheer cover-up or peeks out from high-waisted bottoms for a street-ready vacation look, carrying you from lounging by the water to sunset cocktails with clarity and ease.

Significant Other is known for versatile pieces that move with the wearer, elevating thoughtful details into everyday drama. The Rian one-piece embodies that ethos with sculptural line, clean silhouette, and a cut that travels from pool to beach club with minimal fuss.

Materials / Fabrication

Black one-shoulder one-piece swimsuit
Ruched detailing across the bust
Diagonal keyhole slit from the shoulder to the center chest
Cut-through silhouette

Recommended Care

Rinse after swimming in salt water or chlorinated pools with fresh water
Hand wash in cold water with a mild detergent; do not wring
Lay flat to dry away from direct sunlight
Avoid ironing or heat to preserve fabric and elasticity

Style Check

Aesthetics: 9/10

Bold, angular lines and a sculptural one shoulder silhouette command attention, elevating a classic black one piece into an editorial statement. The ruched bust adds soft structure, while the diagonal keyhole delivers a sharp, modern edge. Overall, the piece reads confident, versatile for poolside or city-ready styling.

Craftsmanship: 8/10

Stitching appears precise with gathered ruching that holds its contour without bulk. The edge finishes look clean on the shoulder strap and keyhole; no visible puckers. The fabric drape falls smoothly, suggesting quality jersey or swim fabric chosen for structure and movement. The silhouette maintains form when photographed at angle.

Affordability: $$$$

The value feels justified by a design-forward form that reads as editorial rather than basic swimwear. The price aligns with its sharp detailing, ruching, and sculptural silhouette, suggesting longevity beyond a single season. Styling options exist across sun and street, making the investment feel reasonable for a standout piece.

Shop More Significant Other

Accessories Scarves Clothing Denim Dresses Pants Skirts Tops

The Significant Other Moodboard

Significant Other Fall 25 Balances Power And Fluidity

Significant Other has always carried that distinct Australian clarity, the kind that feels open and self-assured. Founded in 2019 by Julia Ritorto and Kathryn Forth and based in Adelaide, the label grew out of an instinct for dressing modern women who want balance in their wardrobes. Each collection captures that sense of purpose—strong but fluid, directional without losing ease. For Fall 25, that energy feels elevated, rooted in effortless confidence and a focus on clothes that belong everywhere and nowhere specific.

Significant Other High Summer ’25 Masters the Art of Minimal Drama

Significant Other’s High Summer ’25 collection hums with quiet confidence. This is a line built around restraint, silhouette, and surface. Each piece walks the line between wearable and elevated, with draping, fit, and fabric leaving a strong impression. The result? A series of looks that feel both dressed and undone—and ready to move with you.

Significant Other Stays True To Their Classy, Chic Aesthetic With This Resort ’25 Collection

Significant Other once again blows us away with their exciting release for the Resort ‘25 season. An elegant assortment of beachwear, daywear, and eveningwear, this collection knows how to deliver the sexy and sleek factor to all categories. For instance, we’ve got everything from chic black blazers, ruched white mini dresses with a halter neckline, and the perfect sherbert orange two-piece swim set for those of you planning to hit the beach in style this summer. Plus, don’t forget to appreciate the styling in this Significant Other collection. For instance, we love how a black blazer is unexpectantly thrown over a chic black bikini. Or what about a denim maxi skirt expertly styled without a top to give the look that effortless feel? Clearly, Significant Other knows what they are doing when it comes to great styling.

About Significant Other

Significant Other is an Australian fashion brand that is known for its ‘beach-to-bar’ looks. Designed for the modern woman, Significant Other collections are made with natural fibers, relaxed and flattering silhouettes. Founded by fellow Aussie brand Acler designers Kathryn Forth, Julia Ritorto and Significant Other designer, Amy Nolan, if you are on the search for beautiful dresses that flow effortlessly, you’ve come to the right place. Shop the latest collection from Significant Other, ranging in dresses to rompers, blouses and skirts.