Proper kilts do not have hems. Good tartan material is so woven that no hem is needed.

I believe that Bonny Prince Charley is said to have worn something like a modern kilt.

As a dancer and musician I am permitted to wear "comfort items" under my kilt, especially if I'm sitting on stage in the front row, but I haven't found anything that makes a kilt comfortable in the company of Maine hummingbirds, which are sometimes mistaken for mosquitos in these parts.
MD