Size up at least one whole size- maybe even 2 sizes depending on your shape. I have wider hips and a smaller bust, so my scrub tops are usually difficult to fit because they are tight in the hips and too large around the chest- but this Koi top is tight in both areas. The fabric is thick cotton and does wash well. Wrinkling can be a problem with these scrubs though. However, Koi consistently makes a quality product.