Hey Barb, I don't mark the tartan kilts with chalk, I agree it's too hard to get out and the tartan usually gives a good guide. It's the solid colour kilts that I mark. (I actually use talc powder in a rotary marker and then when I'm done I brush it out with a lint brush.)
I do use pins though, and a good steam iron with a bit of vinegar in the water. I'm not sure about you but I found setting the pleats with an iron first helps sewing the pleats.
You have great tips, thanks for the advice, every bit helps.
cheers
Robert