All/parts of the gear being green means you're missing some skins/textures.
Make sure that for each piece of gear you want to port back, you run it through the converter (if its a m2 from a expansion other than WotLK), and find the .skin and .blp file.
All 3 files for each piece need to be packed into a MPQ patch and placed in the data folder. If you have done these steps and it's still green, then it may be a missing texture issue. To solve this, download the 010 M2 Template for WotLK and run it on the converted m2.
In the template output result window, scroll down until you see the header struct_Textures. In that tab there is a list of files that the m2 relies on for textures, these are hardcoded. Find those .blp files and add them to the path in your MPQ that's specified.
