I originally ordered the regular xxs (loose fit = xxs nowadays) and the length was right above the knee... it looked great and classy/classic but i felt like perhaps the chest height would be better in petite. so i ordered the xxs p as well... decision time:

i decided on petite because the overall dress fit my body better, though it is now shorter (a couple inches above the knee0. still looks classy with a boot, but flirtier. embroidery is beautiful, as others mentioned, fabric is comfortable