James, it is certainly true that throughout the War Confederate troops often wore blue jackets& blue trousers. I'm not certain I can name a source that might give an idea of how many of his men were wearing blue. But the the war is replete w/ examples of
CSA troops wearing captured gear, and the Union was not exempt from such practices, many of Shermans men left NC on their way to the Grand Review wearing brand new unissued NC manufactured trousers.