That is a basic sort of characteristic of kilt construction that, if you really did make one, and did a good job of it, based on instructions from the web, that you really should know.

I don't want to be a dink, but listen to the others here.

You DON'T know as much as you think.
A few answers here really won't be enough.
You need AT LEAST Barb's book to make a decent kilt.
The web instructions are OK, but as you can already tell, they aren't enough.

Just pony up the money, order it, and get to it. I can't emphasize what a great investment the book is.

Not only does it have excellent instructions for kilt construction, it also has a great section on history and what to look for/what makes a quality kilt.

Many of us have bought it, and we use it, and we love it.

There is plenty of support here for us would-be kiltmakers, but to try and teach the most basic, most important aspects of kilt-making....

Really, please, buy the book. Barb is not only the author of the book, she is a very nice person, and is very helpful. It is only fair and right that someone who wants to learn the kiltmaking art pick up her book. We get lots of free support here, so advising someone to buy the book, and to buy it, is a VERY small price to pay for the sharing of all that knowledge...