Baxter isn’t a stock woven tartan. However, Baxter is a sept of MacMillan so can wear the MacMillan tartan.
The Baxter tartans threadcount matches a Buchanan tartan that had been recorded by Logan but later it is called Baxter.
Threadcount A/4 G64 K4 A8 K4 Y16 K4 A8 K4 R64 W/8
Baxter
--------------------------------------------------
MacMillan Old
--------------------------------------------------
MacMillan Hunting