[Portrait of Commander Matthew F. Maury, officer of the Confederate Navy]
Summary
Maury is not in uniform.
Public domain photograph related to Confederate States of America, American Civil War, 19th century, free to use, no copyright restrictions image - Picryl description
There are not many details distinguishing the Confederates from the Union soldiers in many of portrait photographs - they really were from the same country, the same culture. One of the differences that you do find is the less uniform appearance of Confederates: they are much less standard, often wearing bits and pieces of cast-off Union Army uniforms and often, even weaponry. One thing that’s specific to the Confederates is huge Bowie knives, humorously called ‘Arkansas toothpicks,’ often made by local blacksmiths.