I can see the black threads in the photo, but not very distinctly. However, if they seem noticeable to you, looking at the actual swatch, then they probably would not be too attractive in the kilt -- better than a hem, though!

Looking at the picture, I have another concern about that particular fabric. It doesn't look like worsted -- it's too fuzzy. Being unfuzzy is what worsted is all about! I noticed in the sites for the billiard table cloth that all of it is wool, but NOT all of it is worsted, only the top-of-the-line is. I think it's important to have worsted wool in a kilt for many reasons. It's more comfortable -- not scratchy. It will last much longer than other wool, not only because the yarn is much more tightly twisted (which is what makes it so smooth) but also because the fibre that goes into it has a longer staple, giving the whole fabric superior strength. It will not 'pill' on the surface. It will shed water better. It will drape and fit better, 'giving' without stretching out of shape. It holds a pleat better. It's easier to tailor, which can make the end product better, as well. I think it has exactly the right amount of sheen too, though I suppose that's a matter of personal taste. To me, it's like the difference between diamonds and cubic zirconium -- or rhinestones, depending on what fabric it's being compared to! Or a chunk of coal.

I'm sorry I always get so preachy about this subject. I am just passionate about it!

I know it seems like one kind of wool is pretty much the same as another, but they all have their own qualities and are quite different!