I am normally a size 4/6p in all things retailer but read the reviews and opted to go petite on the maxi and size up. i went with the 8p and even with a 32d bust, had no trouble zipping and it fit beautifully. the band is a tad loose, but any tighter wouldn't have fit in the bust. this dress hangs beautifully and is incredibly flattering, especially for those of us with an athletic build.