I purchased this jacket not for water sports, but for when I go for hikes and drive with the top down.  It is a nice lightweight fabric, which is perfect for hiking.  I wear a size 10 dress with a 38d bust and so I purchased the large but I felt it was too snug for this purpose.  I returned for the XL and it is a perfect looser fit for the breathability.  I may need to come back for other colors.