Quick answer

Choose a tankini when you want two-piece convenience with more coverage than a bikini and easier bathroom breaks than a one-piece. Focus on the bust fit first, then the torso length, and pick a bottom rise that matches your comfort level. For a flexible option, consider a Flexi-Size tankini with an adjustable drawstring, paired with mid-rise briefs for everyday comfort.

Tankini vs. swimsuit: which one suits your swim routine?

A tankini gives you the coverage of a one-piece with the ease of a two-piece. If you swim laps, a one-piece may feel more streamlined, but if you want to use the bathroom without fully undressing, a tankini wins. Tankinis also let you mix sizes: you can choose a top that fits your bust and a bottom that fits your hips. This is especially helpful if your upper and lower body fall into different size ranges. For modest swimwear options, a tankini with a higher neckline and fuller coverage bottom works well for family pools or mixed-gender settings.

How to get the fit right: bust, torso, and rise

Start with the bust. The tankini top should feel snug but not tight, with no gaping at the armholes or neckline. If you have a larger bust, look for styles with adjustable straps or a built-in shelf bra. Next, check the torso length. The top should cover your midriff when you raise your arms; if it rides up, size up or choose a longer style. Finally, consider the bottom rise. Mid-rise briefs sit below the belly button and offer moderate coverage, while high-rise options provide more tummy coverage. For a customizable fit, a Flexi-Size tankini with a drawstring tie lets you adjust the length and look.

Fabric and care: what to look for

Look for swimwear with a high percentage of chlorine-resistant fabric like PBT or polyester blends, especially if you swim in a pool regularly. Avoid cotton for swimwear as it absorbs water and stays heavy. For bottoms worn outside the water, organic cotton jersey is breathable and soft, but keep in mind it is not designed for swimming. Always rinse your swimwear in cold water after use and lay flat to dry away from direct sunlight to extend its life.

Decision rules for buying a tankini

  • If you want adjustable coverage: Choose a tankini with a drawstring or tie front, like the Swim Flexi-Size Tankini, so you can change the length and look based on your activity. Look for adjustable features to accommodate different comfort levels.
  • If you need extra bust support: Look for tankinis with built-in bras, adjustable straps, or consider layering a racerback bralette underneath. Support is key for swimming and lounging; don't compromise on fit.
  • If you prioritize modesty: Opt for a tankini with a higher neckline and pair it with mid-rise or high-rise briefs that offer fuller coverage. Modest swimwear options are available without sacrificing style.
  • If you swim in chlorinated pools frequently: Choose a tankini made from chlorine-resistant fabric and rinse it after every use to prevent fading and stretching. Fabric care extends the life of your swimwear.

Product facts

  • Swim Flexi-Size Tankini - Black ***: Swim Flexi-Size Tankini - Black: drawstring tie at the front so you can change the look; perfect for the pool, wild swimming, or hot tub; pair with Molke Swim bottoms. The adjustable drawstring lets you customize coverage and style, making it a versatile choice for different water activities.
  • Swim Flexi-Size Tankini - Blue Rainbow ***: Swim Flexi-Size Tankini - Blue Rainbow: colourful coverage; drawstring tie at the front; perfect for the pool, wild swimming, or hot tub; pair with Molke Swim bottoms. Offers the same adjustable fit as the black version but with a vibrant print, so you can express your style while staying comfortable.
  • Mid Rise Briefs - Iris: Mid Rise Briefs - Iris: no elastic, made from soft GOTS-certified organic cotton jersey; soft bands don't dig in. These briefs provide all-day comfort and are a good match for the Iris collection, but they are not intended for swimming.
  • Racerback Bralette - Doodles ***: Racerback Bralette - Doodles: part of a matching set with bra, bralette, and briefs; available in sizes and styles; modelled by Sofaya in 3XL Epic bralette and 2XL mid rise briefs, and Eliza in M. A racerback bralette can be worn under a tankini for extra support or as a standalone top for low-impact activities, and the matching options make it easy to create a coordinated look.

Who is this for?

Best for

  • Swimmers who want two-piece convenience with more coverage than a bikini
  • Anyone who needs different sizes for top and bottom
  • Those seeking modest swimwear options for family or mixed-gender settings

Not for

  • Competitive swimmers who need a streamlined one-piece
  • Those who prefer the simplicity of a one-piece suit