You'd actually have to create a new icon to do this. Using /icon procs you can build a little routine to layer overlays onto the icon.
It might not strictly work for actual overlays in the list. You might have to find some way of just figuring out what goes there instead, and using that. For example, in your icon-builder proc you could simply loop through all equipment, clothes, weapons, etc., and overlay their images onto a blank icon starting with the lowest layers first.
Or instead of using overlays. You could blend them into the icon. Because blending will make them one. So it might show up as it. But I'm not quite sure about it :p
You'd actually have to create a new icon to do this. Using /icon procs you can build a little routine to layer overlays onto the icon.
It might not strictly work for actual overlays in the list. You might have to find some way of just figuring out what goes there instead, and using that. For example, in your icon-builder proc you could simply loop through all equipment, clothes, weapons, etc., and overlay their images onto a blank icon starting with the lowest layers first.
Lummox JR