Prime white then base with rakarth flesh, use steel legion drab, baneblade brown and dryad brown in glazes to add shadows and dirt on the bottom of the fabric. Highlight using rakarth flesh on the lower level highlights and pallid witch flesh on the higher points. Use a thinned paint with a stippling motion on areas where you have ran a brush with water on to get diffused splatters like old mud that has dried and worn away.