I'm sure that your English is better than my French!

I would ask for a swatch or two before I bought a whole kilt length, and I would ask for a swatch with the kilting selvedge. Some kilting selvedges are better than others. The price is decent but not all that cheap (works out to about $60/yard US) - that's still about $240 just in tartan for a kilt. If you're willing to be patient, you can get better deals on eBay.