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Now that I've figured out my right size in prAna - small - I will not deviate from it. This one is medium and is just a bit too roomy to provide the support I want for being active (yoga, etc.). Still, I will wear it because it's also not too big that I will 'fall out' or uncomfortable. Moderately heavy breasted, D cup with size 30 rib cage and 33 bust, size Small is definitely my right size.