Inside armorgrp.dat, you can define a mesh and a texture, for each armor piece, for each character, so basically if you have draconic boots, there are 16 different meshes and textures defined, one for each race. What you need to do is, copy the lines of the Light armor for kamales and paste them in heavy and robe slots, and that's it.
Since you're just starting i'd recommend you to export armorgrp as a txt, import it to excel or some other spreadsheet/calc program, and edit stuff from there, way easier than working with plain text.
Or else you can get UFE here, which allows you to edit .dat files in cell format
https://www.l2jbrasil.com/topic/58795-ultimate-fileedit/