It's a version of the dresdan plate. North, S,E,W,NE,SE,SW,NW are all the pointy dresdan made by cutting a flat top blade that is stitched like a necktie to create points. The in between smaller pieces are likely appliqued beneath the plate,and all is appliqued on top of the background...at least that's how l'd do it. The sewist took care to orient the plaid as centered and in straight of grain direction when cutting.