ARO perfect fit and measurement guide

Size Guide

1. Take measurements using soft tape measure.

2. Measure bust, waist, and hips.

3. If you are in between sizes, we recommend sizing up for a better fit.

Top Fit

Size Bust Size (in) Bust Size (cm) Cup Size
XS 30-32 76-81 A
S 32-34 81-86 A-B
M 34-36 86-91 B-C
L 36-38 91-96.5 C-D

Bottom Fit

Size Waist Size (in) Waist Size (cm) Hips (in) Hips (cm)
XS 23-25 58-63.5 30-32 76-81
S 25-27 63.5-68.5 32-34 81-86
M 27-29 68.5-74 34-36 86-91
L 29-31 74-79 36-39 91-99

One Pieces & Clothing

Size Bust Size (in) Bust Size (cm) Cup Size Waist (in) Waist (cm)
XS 30-32 76-81 A 23-25 58-63.5
S 32-34 81-86 A-B 25-27 63.5-68.5
M 34-36 86-91 B-C 27-29 68.5-74
L 36-38 91-96.5 C-D 29-31 74-79
Fit Model


Measure around your chest at the fullest point of bust. Make sure measuring tape is relaxed and not tight. Please wear unpadded bra while measuring. Find your bust measurement above and pair with cup size to find your size.


Bend to one side to find your natural indentation in torso. This is your natural waist. Run the tape around your natural waistline, keep tape parallel to the floor and one finger in between body and tape for a more comfortable fit.


Measure around the fullest part of hips and bottom (approximately 7”-9” below waistline), keeping tape parallel to the floor.


Hi guys! I am SO excited you popped in to see us at aro swim! When I first started ARO on my couch one year out of college I never thought it would grow this much! I love creating pieces that not only make you feel confident but also do good for the world around us! I am SO passionated about our environment and building women up, which is why I started aro! I hope aro is a catalyst to a bigger conversation about self love, Mother Nature and women supporting women. I hope you find something you love here and if you don't please send us an email so we can continue to be better, do better and create for you!

with so much love




ARO’s luxe sustainable line is designed for all body types. ARO was created to find the perfect mix of wearable and chic swimwear that is eco-conscious. Our swim not only looks fab on the beach but can also transition to be worn with your fave pair of cut-off shorts or baggy sweatpants for a chill day with your girls!

We are always creating the hottest trends and thinking outside the box to bring you the best of the best. We source luxurious eco-friendly fabrics and trims while producing in small batches to reduce waste and our carbon footprint! ARO is a line where we love to learn from our customers and are always pushing ourselves to be better and do better. We hope everyone can find something they love and feel confident in!