If you use my shoes mod, you can do a play now with the 08 celtics and scrolling through the unis, Garnett will wear my modded and coloured shoes with the 2 modern unis, but it will switch to an old style edit with the older unis.
However it colours like it used to when I did that same mod a few years back. I then had to edit the ed file to merge sections but that isn't working so far.