I would suggest using a casual kilt like Sport kilt which closes with Velcro.
if you are carrying a heavy pack you will want a high percentage of the weight distributed on your hips. Anytrhing such-as a heavy kilt belt or any belt for that matter may interfere with this. The buckles and straps which close a more trad kilt might even rub you raw.
When we teach proper load distribution we talk about 60% of the weight should be carried on your hips. This is not absolute everyone is different.
but this is a general rule of thumb. Also get rid of all the junk people like to carry on their waist. knives cell phone etc. I Cant tell you how many soldiers still have that stuff mounted on their uniform belt then try to put a heavy padded hip belt for their ruck on over that.
There are quite a few who hike kilted on this site. It would be interesting to hear their experiences.