The 14th Brooklyn wore their Chasseur uniform for their entire service.
The 146th NY just received their uniforms that summer and had them at Gettysburg. The 140th NY did not.
The 114th PA had their Zouave uniforms for their entire service. Their first combat was Fredericksburg I think. They had them at Gettysburg.
Those three are the only regiments that had "full" Zouave or Chasseur uniforms at Gettysburg.
Some units had partial. The 73rd NY may have had some of their members still with their Chasseur jackets, and possibly some fezzes. There are existing photos of the unit with both. Whether they still had them full, or partial at Gettysburg is still up in the air. At least in my research. It was important enough that the veterans used a model in their Chasseur uniform for their monument at Gettysburg.
The 72nd and 95th PA had a stylized jacket.
The 109th PA had a Chasseur jacket trimmed with a red, white, and blue braid.
Its possible, but not likely, that the 23rd PA may have had some jackets left.
That's all I can think of on the spur of the moment.
