Infantry uniform, 1865-1872

[Oregon Bill]

OK, so my understanding is that the uniform did not change from the Civil War period until 1872 -- and even then it would have been months or a year or more before updated uniforms replaced those in service, especially in the West.
Obviously, the cartridge pouch would have been repurposed to handle .50-70 ammunition instead of .58 minie cartridges. Any other modifications?
I note that soldiers in a photo of a company of infantry drawn up in formation at the site of the Modoc War in far northern California in 1872 appear to be wearing sky blue trousers, standard fatigue blouses/sack coats and Hardee hats as they hold their Trapdoor rifles in .50-70.

http://www.legendsofamerica.com/photos-california/US%20Army%20at%20Gillems%20Camp,%201873.jpg

[Drydock]

Left over CW uniform stocks and accoutrements were issued up until 1880, when they were finally exhausted, to the great relief of the Army.  These tended to be Shoddy, and quickly fell apart in the field.  This lead to many campaigns where troops went out in uniform, and came back in rags, to the great glee of the press, who blamed the Army for substandard design and material. When in fact it was Congress forcing these stocks to be used up, before releasing funding for newer material and designs allready in hand. 

[Pitspitr]

It's hard to tell from the quality of the picture, but it does appear that a couple of the guys on the right of the photo are wearing the M-1872 folding campaign hat.

[Oregon Bill]

Jerry, i will try to find a better version of the image. This one is cropped. There are some guys on the far right who are definitely wearing something other than the "Hardee."

[Trailrider]

In addition, officers and enlisted men tended to save whatever "good" uniforms they had for use in garrison, and used whatever they had left over from the CW or could scrounge/buy from the suttler's store for use in the field. Lt. John Burke, General Crook's aide wrote that the troops looked more like a band of brigands than an army! Photos of the Third Cavalry officers showed about every uniform and civilian clothing and combinations thereof! Even Crook eschewed a uniform in the field, dressing in a canvas suit and pith helmet. In garrison, it was something else, however.

[CPL Jayhawker Jake]

It's really hard to tell exactly how the troops in that picture are equipped, but it does look like Civil War equipment to me.  However, you must remember that it's a formation, and no inspection-ready unit has ever survived contact with the enemy!  Equipment worn for something like that would probably have little in common with what was used on Campaign, as has already been touched on.  By 1873, soldier/homemade Prairie/Fair Weather Christian belts would have been common in the field, and in some cases, in garrison as well.  Gotta love the Army, they'll issue a mountain of junk that doesn't work, and it's up to the soldiers to buy, make, or scrounge up the equipment that does!  Somethings never change.