The photograph below is from the Library of Congress and is titled: Portrait of Maj. Gen. George G. Meade, officer of the Federal Army, and staff, vicinity of Washington, D.C., June 1865. The flag on the left is a National flag and I believe the flag on the right is the headquarters flag with the eagle within the wreath. I believe the pattern lines up with the full image of Meade's flag which can be found in the book "Arms and Equipment of The Union: Echoes of Glory."