I think its fine with the following in mind:

1. If your trying to match with someone else, IE be in uniform it could be a problem.

2. You will have to pick the white thread out of the selvage. Which depending on your ability at thread picking, and ability to deal with the total maddness that will ensue if you screw it up make it either a steal or a waste of money. You could ruin the selvage if you are not careful and end up with a kilt that is unraveling

I have alot of fabric like this as loaner greatkilts for new recruits in my reenactment group, but try to push people into constructing a real 2 piece great kilt out of proper colored and woven tartan asap.