Sydney-based label Sir has dominated the Australian resort-wear scene for women since 2014. With languid shapes and effortless bohemia, its pieces convey a sense of permanent vacation – they’re the kind of clothes you slip onto skin warmed by the sun.

Now it’s expanded from resort wear into swimwear with the debut of Sir Swim, a refined collection of cossies arriving just in time for the Australian summer. Sir Swim evokes the brand’s ’70s aesthetic with pool-ready pieces perfect for lazing by the water.

For the brand’s founders, Nikki Campbell and Sophie Coote, branching out into swim was a natural progression.

“Sir was born by the sea. We’ve always celebrated the essence of quintessential summer dressing, designing our collections with pieces that can be worn with swimwear,” they explain. “Our collections continuously feature separates and intimates, so the expansion into swim was something we’ve always wanted to dive into, and this felt like the perfect moment.”

Drawing inspiration from Palm Springs pool parties, the range features minimalist shapes such as string bikinis, racer-style one-pieces and retro balconette bras paired with high-waisted briefs, all in a palette of white and black, plus a single bold floral print.

The Ambroise print – red and yellow blooms and forest-green leaves on a white background – is the star of the range, appearing on swimwear, ready-to-wear pieces and accessories (including a scarf, a sarong and a cute scrunchie bag). It makes for striking pop of colour when contrasted against fresh white linen – a classic Sir look. The collection also includes wide-brimmed hats, fringed beach towels, bucket hats and totes.

Sir’s swimwear and Resort ’21 collections are online now.