SIR the Label Swimwear: Bikinis, One Pieces and Matching Prints

SIR the Label swimwear is printed to match the clothes, so a bikini can share its pattern with a silk shirt, a sarong and a maxi dress. The pieces are cut in a lightweight lycra with generous stretch, and most triangle tops have sliding cups that tie at the back and can be worn as a halter. This guide sorts the current SIR. swim on Coveti by coverage, then shows how to build a matching beach wardrobe.

What SIR. swimwear is made of

Almost every SIR. bikini in the current edit is 76% nylon and 24% spandex, lined in a similar nylon and spandex. The one pieces use a form fitting scuba lycra, which is thicker and smoother. A few styles, such as the Hendry and Emiliano, use a lustrous swim fabric with a slight sheen, and the Eliana ruffled set is cut in a mesh with stretch. The prints are SIR.’s own, engineered to each garment.

Triangle bikinis

The string triangle is the SIR. house shape. Sliding cups let you choose the coverage, and the ties work at the back and as a halter.

• Sona String Triangle Top in Geo Scape, $280, with the Sona String Brief, $280. The print matches the Sona maxi dress, shirt and pant.
• Mireli String Triangle Top in Rose Parquet Plum, $280, with the Mireli String Brief, $280.
• Lilia String Triangle Top in Daisy Meadow, $280, with the Lilia String Brief, $280.
• Calypso String Triangle Top in Sorbet Stripe, $280. The Sorbet Stripe print was made with FWRD as a SIR. x FWRD exclusive.
• Marlowe Reversible String Triangle Top in Monochrome Stripe, $280. Reversible, so two looks in one.
• Eliana Ruffled String Triangle Top in Aliera Floral Mint, $310. A reversible mesh triangle with an adjustable underbust tie.
• For plain colours: the Hendry in Black, $240, the Louis in Ivory, $240, the Clarita in Tangerine, $250, and the Emiliano in Limone, $250.

Halter and balconette tops

If you want more support than a string triangle, choose a halter with fixed ties, and for the most support, an underwired balconette.

• Amado Halter Triangle Top in Mocha, $280. Fully lined, with sliding cups and ties at the back. Also in Black.
• Alva Halter Triangle Top in Laila Stripe, $280.
• Cleo Balconette in Carob, $340. Underwired with skinny straps, the most supportive top in the edit.

Bikini briefs by coverage

• Minimal: the string briefs, all low rise with ties at the side so you set the coverage yourself.
• Moderate: the Amado Beaded Brief, $280, with matte beads at the sides, and the Cleo Shaped Brief, $280.
• Medium: the Lilith Brief in Rust, $280, with fixed sides, and the Hilde Ruched Brief, $280.
• High waisted: the Hendry Classic High Brief in Black, $250, seamless at the front.

One piece swimsuits

• Talia One Piece in Black, $460. A V neck with wide straps and a straight lower back, in scuba lycra. Also in Ivory.
• Amado One Piece in Black, $460. Strapless, with a removable halter strap.
• Amado Tie One Piece in Mocha, $430. A halter with a scooped neck that ties at the back of the neck.

Cover ups and sarongs

SIR. makes sarongs in the same prints as the swim. The Calypso Sarong in Sorbet Stripe, $380, is a cotton mini sarong with an adjustable tie and a pleat, and the Eliana Mini Sarong, $380, is a silk and wool blend. For a longer cover up, the Ellinor Midi Dress, $580, is a cotton crochet with an open back.

How SIR. swimwear fits

The brand describes the swim as fitting true to size. Most pieces use the same 0 to 4 sizing as the clothes, so a SIR 1 is a UK 8. Choose your usual size, and size up in the balconette if you are fuller in the bust. Full conversions are in our SIR size guide.

How to care for SIR. swimwear

SIR. recommends a cold hand wash, separately, then drying flat in the shade. Do not iron, do not soak and do not tumble dry, and rinse thoroughly after each swim. The brand also advises keeping the swim away from suntan lotions, oils, rough surfaces and heavily treated pools and spas.

Build the matching look

Because the prints repeat, you can build a full holiday wardrobe from one story. In Geo Scape, wear the bikini on the beach, then the Sona Shirt, $780, and Sona Pant, $750, to lunch. In Sorbet Stripe, add the Calypso Layered Mini Dress, $720. For more holiday pieces, see SIR Resort 2027.

Editor’s note: buy one SIR. bikini in a print you love, then add the matching shirt. It is the easiest way to look put together on holiday with almost no effort.

Frequently asked questions

What is SIR the Label swimwear made of?

Most SIR. bikinis are 76% nylon and 24% spandex with a lining in a similar blend. The one pieces use a thicker scuba lycra.

Does SIR swimwear fit true to size?

Yes. The brand describes the swim as fitting true to size, using the same 0 to 4 sizing as the clothes. A SIR 1 is a UK 8.

Can SIR bikini tops be worn as a halter?

Most of the string triangle tops can. They have sliding cups and ties that work at the back and around the neck.

Which SIR swimsuit gives the most support?

The Cleo Balconette, which is underwired, and the Talia One Piece, which has wide straps and medium coverage.

How do I wash SIR swimwear?

Hand wash cold and separately, dry flat in the shade, and rinse thoroughly after use. Do not iron, do not soak and do not tumble dry.