I should have clarified Battle Flag of the Army of Northern Virginia (IE the “confederate” flag).
It can get confusing.
Interestingly, the “Battle Flag” was originally square in its dimensions (like the one flying, at least for now, at the SC state house).
The “normally dimensioned” (+/- 5:3 length to height ratio) Flag of the same basic design served primarily as the Confederate Naval Jack.
To confuse things still further, while the square Battle Flag was designed and first used by the Army of Northern Virginia, it was subsequently used as a battle flag by other commanders throughout the Confederacy.
And, with all that said, I doubt there was perfect consistency in the use of the two ‘designs’ during the War.
One thing we know for sure is that the flag in question is NOT the “Stars and Bars”, no matter how often media sources incorrectly call it that.
PS - This is what I picture when I think about a Virginia Battle Flag:
http://www.crwflags.com/fotw/flags/us-culp.html