Kancans run in odd sizes. All styles are available in size 0-15. The size charts are in the images for your reference.
One of the main reasons Kancan's are so popular is the incorporation of spandex, making them super comfy! But because of the stretch, if you are between sizes, I would recommend sizing down in all styles. (For reference, I bounce between a 2/4 in most brands, and the 3 is a perfect fit for me.)
All of the details and specs of each style are listed on the infographic.