I have thin feet and I have found that the plain patent lanvins to be TTS. The crisscross patents seem to be cut a bit thinner, so I go up 1/2 size. I've not tried on the satin lanvins, so I can't help you there. There really isnt that much of a difference length-wise between each of the sizes, one half size up is only an extra 1/8 in. It seems that the width is what determines the exact size. Hope this helps.