I am 5'7" and a size 10/12 (38B). I followed the size on the chart and ordered the dark gray dress in XL, which fits me to a "T".  The fabric is heavy and stretchy and comfortable. (If you are familiar with GownTown vintage-style dresses, the fabric is quite similar to theirs.) The style of the dress is figure-flattering and looks good with or without a petticoat. Note that the sweetheart neckline is pretty wide (even on my broader shoulders) and the straps on my regular bra were exposed and, because it sits so wide all around, even wide-set halter type straps were exposed on me, so I needed to wear it with a strapless bra.