For my 2 cents, I say get thee down to JoAnns or some other fabric shop and find some material that you like and make your first kilt with that. Trust me, a year from now you'll look at it and probably won't want to wear it all that much. Make your mistakes on this one and you'll be a lot happier a year from now.
You can also look online for "wool plaid" and usually come up with something at a good price that will work. There are lots of materials out there that are close to Black Watch that are inexpensive and will give you experience working with setts and stripes.
A year from now you can use it as a "beater" kilt to mow the yard in.

Then....when you are fairly competent, buy the good stuff.