I bought a regular XS and it goes to my ankle (should have purchased the petite XS for better length). But, other than the length it fits beautifully and the self-bra provides very nice invisible support. Self- bras don't always work for me but in this dress it fits nice and smooth. I did order the red in petite XS to see the difference in length. I was really hoping it would have been available in brown. Oh well.....just means from now on I order petite and regular XS to compare length and sizing. Very nice dress, nice weight to the material and beautiful fit.