From the pictures, I’d say that this flag dates to around 1880 or 1890 and with what you said on thread count and other details, also indicate post war.

I don’t recall seeing a flag made by the Ladies of Richmond, for war use, with the blue cross extending on to the field of the flag.

pre auction pictures from Agusta Auction Company of Vermont web site.
http://i566.photobucket.com/albums/ss108/bagend-Flags/02272copy.jpg

http://i566.photobucket.com/albums/ss108/bagend-Flags/0227copy.jpg

Ben’s picture of same flag, altered header.
http://i566.photobucket.com/albums/ss108/bagend-Flags/BenFord-Feb282007053.jpg

Happy Trails!
Tom Martin