Depending on if you have an actual photo or are working strictly from text, in the latter case I might opt for "[color] tonal checked wool knit" if other descriptors indicate it's stretchy, [color] tonal checked wool weave" if not (or if not indicated).

Because I also love Lisa Jane's motif suggestion, a combo could be "[color] wool skirt with a tonal checked motif"

In the former case, it would be easier to accurately describe the motif, i.e. tonal plaid as seen in my second link, or "textured monochromatic houndstooth weave/motif"