>>18528943 (OP)
black with a single darker vertical line on the back is the dream, but I'll take plain black ones in general. Also, quality is pretty important. The cheaper dark ones tend to have these darker and lighter blotches because they don't stretch over the legs in an even manner. It's very clear when someone is cheaping out.
I'm so happy tights season is approaching again bros. It's one of the only pieces of clothing women can wear on a day-to-day basis that is simultaneously hot and classy.