High Waist Bikini Bottom | The Sumba

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Size: XXS

Color: Celestial Blue

Size Chart

AUS/UK 6 8 10 12 14 16
USA 2 4 6 8 10 12
EUROPE 32 34 36 38 40 42


Measurement Chart (cm)

Chest 76 - 81 81-86 86-91 91-96 96-101 101-107
Waist 62 -66 66-70 70-74 74-78 78-82 82-84
Hip 84-87 87-90 90-93 93-96 96-99 99-102
Suit Length 74 75 76 77 78 79
Arm Length 151 155 159 163 166 170


Chest: measure the fullest part of your bust

Waist: this measurement is taken just under your ribcage

Hip: measure around the fullest part of the hips

Suit Length: the crotch seam at back of suit to neck seam

Arm Length: side of neck seam at base of collar, to wrist seam

Only 10 left!
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Model is wearing a size S

Sustainable style; made with Econyl - sustainable UPF 50+ regenerated nylon. Protects you from the suns harmful rays.

Durable Design; crafted with high-quality fabric designed to endure. Will last twice as long as your regular bikini.

Seamless edges plus soft, luxurious Italian fabric, comfortable enough for all-day adventures.

Double-Lined, for comfort and coverage.

Cheeky cut; showing off some cheek for sexy yet dependable coverage.

Just the right high rise; not too high, but just right.


Worldwide shipping from Bali & Australia. Free Shipping for orders $180+.

Regular International parcels take approximately 3 weeks. Express shipping option available at checkout for $15 AUD.

Please read more of our Shipping Policy here.


We accept exchanges or returns for change of mind, as long as it is processed within 14 days.

Please follow instructions on our Returns page.


We stand by the quality of our swimsuits, they are tailor made with high quality Italian fabric.

We offer a 12 month warranty from date of purchase, shall the make, material or hardware malfunction.

Read more about our warranty here.

To keep your swimwear happy and healthy, please follow our general care guidelines:

Our suits are happiest when hand-washed separately in cool water so the colours do not bleed. Please avoid traditional washers and abrasive materials like velcro and bleach. Do not leave wet swimsuit in a bag. Air dry in a shady spot.

Have a question? You can reach us below or on live chat.


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Silky Soft High Waist Bikini Bottoms made with sustainable Italian fabric. Designed to last twice as long as your regular swimsuit.  Better for you and better for the planet!

Double lined, and made with UPF protection, this two piece bikini will keep you protected from the suns harmful UV rays.

Seamless edges and smooth as silk fabric, our high waist bikini bottom will quickly make these your new go-to. Cut to show off those cute cheeks, the mesh detailing adds style without sacrificing comfort. 

Booty-Friendly Bikini Bottoms.  Spending all day in bikini bottoms can feel like a chore, until you try on our buttery soft high rise bikini bottoms. We design, cut and sew, all our bikini bottoms for ultimate comfort and function, from the smooth strong seams to the sustainable fabric.

The perfect bikinis for surfing with a flattering high rise bikini, they pair with the Sumba Cropped Rash Guard, and  can mix & match with any of our two piece tops. 

Twelve month Warranty from date of purchase.

Customer Reviews

Based on 5 reviews
C.G. (Melbourne, AU)
Great shape fit and cut

Absolutely love these bottoms … they are a such a great fit and cut. The high waist it so flattering and looks great with any other bather top … there is something about a high waist bottom that is so stylish yet practical … LOVE!!!!

My number one

It was my first two-piece from OSB & I love it like the first day! Fits perfectly and nothing slips! A dream.

F.C. (Madrid, ES)

Love this! Easy to combine with any top! 😊

Love the green!

super flattering on and love the high waist

So helpful!

I was not sure about the size for my girlfriend so I messaged the shop for help. They were very responsive and super helpful. Thanks so much team!!!

Recycled Materials
UPF 50+ Protection
Luxuriously Soft Fabric
Made With Love

Perfect two piece cut

Our two piece bikinis are made with a luxurious sustainable buttery soft fabric. 
They are the perfect intersection of sporty and fashionable.  With a comfortable seamless design, both functional and flattering and a tailored feminine design that is suitable for leisure or athletic activities.

Designed for comfort

We’ve designed our swimsuits for comfort right down to the smallest detail. The luxuriously soft fabric, double lined, with innovative cupless support and smooth seams will hold you in and support you, with all your water activities.

Sustainable Swim

We value slow fashion over fast with a focus on sustainable fabrics and ethical production. Crafted from regenerated nylon that is designed to last twice as long as your regular swimsuit. Our swimwear is designed & made in Bali with love, with 10% of each sale donated to those in need through our Giving Back initiative.