First of all, welcome to Xmarks. And, secondly, not everyone has a "butt". My hip measurements are almost the same as my kilt waist. Of course I have a bit of a middleaged spread, aka beer gut. I have two suggestions. First, Steve of Freedom kilts has a great video on measuring for your kilt posted as a sticky in the Freedom Kilt section of this forum, and last, call Rocky and discuss the measurements with him.