http://users.tinyonline.co.uk/chegc/kiltsite/page2.htm

http://www.scottishdance.net/highland/MakingKilt.html

These will get you on the right path, and you can ask as many questions as you like, and somebody will have the right answer, most likely.

Also, try to get some close-up looks at some real kilts if you can. You'll notice a lot of little things that will help you 'get' what the patterns are trying to tell you.

Good luck.