Based on the provided size chart and other reviews I read, I ordered a 2XL for measurements of 44/34/44.  I was worried the dress would be too big, since the fabric does have some stretch.  However, it fit perfectly and is very flattering, hugging in the right places and laying smoothly along the waistline.  The sleeves are a very flattering and comfortable cut, and there's no need to wear strapless undergarments with this dress unless you want to pull the sleeves off the shoulder (which you totally can).  If you're busty like me, you will be featuring some tasteful decolletage for some subtle vavoomery, but not in a way makes you feel like hoisting up your neckline due to self-consciousness.  I bought the dress in the small polka-dot blue and large polka dot pink prints.  Both fit the same, but the blue dress is a lighter-weight fabric than the pink dress, which is somewhat thicker and coarser.  That said, both are very lightweight and breathable.  Both dresses do wrinkle easily, so they just need a good steaming.  This is a very easy-to-wear dress for summer or hot climates; you can just throw it on and it's light-weight, comfortable, and flattering without any fuss.