Black marker blended with 10% cool grey marker
White accents- white out pen for sequins, white Prismacolor pencil for lame, white gouache for high contrast whites on lame, white gel pen for small white accents
Black Prismacolor pencil for detail lines: seams, etc.
The key to doing metallic fabrics is to have high contrast lighting from one side. The value range on metallics is extreme, going from almost black to the actual color of the fabric to highly reflective whites. Even white fabric will go 50% black in the shadow areas in order for the reflective part to show. I tell students to be careful of reflective light from other objects. If an orange table is next to the white sequin or lame draped fabric it will reflect red into some of the shadow areas near the table.