that it is none too comfourtable supporting a kilt with sporran with your abdomen for more than a few hours
Just want to share a tip from the dance world. As you can imagine, dance kilts can go through many owners in their lifetime. To save on hemming or to make do for a few competitions waiting on that expected growth spurt, dancers may sometimes wear suspenders on their kilts to pull it up a few inches.

Suspenders can also aid in 'supporting' the kilt so that your abdomen doesn't go on strike. I believe some of the military kilts come with suspender buttons already sewn on due to the heavy weight of the kilt.