Darkish grey tights, or maybe a contrasting colour ? cobalt blue? If grey tights I'd go for a shoe in either a neutral or a bright contrasting colour (see my theme?). If contrasting tights I'd go for a grey or neutral shoe.
Or you could go black opaques and either black or neutral shoes. I think you could experiment with textures, for example soft-looking tights, IYKWIM ? ones with a plush finish or a bit of cashmere ? and then a leather or patent shoe.