I sized down after trying the one recommended by the 'find your size function' which was massive on me, and it seemed to fit great. Then I actually went for a swim in it.. maybe they aren't designed to actually be used in the water, but it got all weirdly saggy round the back, and swimming seemed to stretch the straps so it started to loose suppor
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Thank you for your question!
With any of our products, we advise taking your chest measurements and comparing them to the nearest size on the product size chart. The product has 18% elastane, so it has plenty of stretch, so if you feel you need to size down to have a closer fit, I definitely think that would be an option, depending on your preferences!