@NHhighlander It would be a huge task to hand spin enough yarn for a kilt - working to produce such fine stuff is best left to mechanical production lines.
I spin yarns for myself starting from shorn fleeces, but I make yarn many times thicker than what would be required for tartan cloth for a kilt, as I am knitting it. Even so the yarn for one garment can cake months to produce.

I think that most yarn is now defined by the number of metres per gram, so once the basic size is confirmed you can make fair comparisons when looking for the colours you need.

Anne the Pleater