Are there other varieties of kilt that are not Scottish?
Yes there is.
DNKE (Damn Near Kilt Em) is very popular. I have a couple of them.
They are made with modern materials and come in regular colors, not plaid. I have a Smithy that is made with very heavyweight denim and is very tough. It's like a pair of Carhartt cargo shorts but way more comfortable. I also have a Techlite Rogue. It is made with lightweight water resistant material. It's great for hiking and outdoors.
Guys will give you chit about wearing them but they are so comfortable to wear and the best part is that woman love a man in a kilt.