Let us go to the source for a change. There are 7 listings for "confederate" tatrans. This is the Scottish Tartan Authority listing for Dr Smiths fine tartan:

Name of Tartan:
Confederate Memorial (Military)

Alternative Name: Sons of Confederate Veterans
ITI Number: 4195
Category: American Military
Designer / Source: Smith, Dr. Phil
Date: 1995
Slog: BNR:WBW
Colour Sequence: BNRNYNRWBW
Thread Count: LB24-N8-R8-N8-YY4-N112-R36-WW2-B8-WW6

Confederate Memorial (Military)
Notes: Designed by Dr. Philip Smith in 1995. Grey is the colour of the Confederate States of America. The fields represent the Confederate Army in line of battle-- light blue for infantry, flanked by red for artilllery and yellow for outriding cavalry. The red field represents the Confederate flag in true proportions. Registered with TECA. to Phil Smith on 10-08-96. Sample in STA Johnston Collection labelled "Sons of Confederate Veterans". D C Dalgliesh of Selkirk has exclusive rights to the weaving in wool (Jan 2005). Available in cotton from Peter Wilson in SC, USA. Cotton sample from Lochcarron. July 2011: weaving rights probably being transferred to Fraser & Kirkbright of Vancouver. At this time Phil Smith mentioned the colour name of 'Butternut' referring to the ground colour of this tartan. Quite wrong apparently - the colour is 'Confederate grey' and the 'Butternut' name came from a period in the Civil War when some of the soldiers were dressed in fabric coloured with a dye from the Butternut tree - the grey was very scarse and was reserved for the officers.

I hope this helps the discussion. You could also contact Dr Smith.