Release Piccolo instead of Craft Armor lvl70 (click on the picture to download):
For the jacket file ..._j_... the S1 to S5 stands for the skin color you choose when creating the character. E.G. in this Screenshot it was the 5th skin color, so i have to overwrite a_bs_10_j_n_o_s5.dff
Path for the .dffs in obj.pak is item\mesh_battlesuit
Since you have a gearglow like this when upgrading:
You can also mod the glow to a little white stripe or to nothing, or to a mixture. (Click on one of the gifs to download both versions)
(if you look at the files in the original folder there, you can see which file overwrites which upgrade ranges)