Substance Painter - Perfect both for real time and pre-render
Texturing was made using Substance Painter. The base of the ghost is a pure aluminium, with a white grey fill layer above it. I put a mask on this second layer, controled by an edge generator to damage the paint and reveal the aluminium below.
A third layer to add a bit of dust, and we're done.
A powerful texturing software every 3D artist should use.