The first time we meet Professor McGonagall, she is a cat waiting all night to see Professor Dumbledore while the rest of the world celebrates. Some, probably Dedalus Diggle, celebrate by shooting wand sparks in the air, although the Muggles interpreted them as shooting stars. Although it was reported in Kent, chances are good that McGonagall was able to view a few as well.
5-7 skeins (820- 1148yds) of Green Tea Heather
1 skein (164 yds) of Basalt Heather
Skills: provisional/invisible cast on (COWYAK
picking up stitches
The entire pattern, not including the intarsia, is both written and charted.
If you don’t like doing color work, I have also included a PDF with conversions to knit and purl for the images (reverse stockinette on a background of stockinette).