A minor correction to KWD's post - my tartan is Marton Mills Davidson Ancient, not Modern. Comparing it with other items I have in Davidson that aren't PV (sash, scarf, and scrap tartan remnants from Lochcarron), I notice that on the Ancient from MM - the red grid line goes through the black and blue warp/weft, whereas on Davidson Modern from other mills it appears to only go through the Black warp/weft (I could be wrong on this one tho, not having the two in front of me). That would make the red "grid" appear much larger.

Mine is also in PV, and considering the MM PV line seems to be aimed more at the School Uniform market than kilts, I would understand the smaller set size.