The best way to wear black jeans to work is to pair them with tunic sweaters and tops. If the top of the pants are covered it's hard to tell the details of black pants. Adding riding boots makes them practically undetectable!
I stick with my Fall uniform and add scarves or a nice statement necklace and the outfit is instantly transformed. Sticking with neutral color palettes also helps too. I never look dressed down and yet I'm super comfortable all day long.
I am so obsessed with this scarf and it's under $50. It's a perfect way to add red to a neutral outfit, which is what I plan to do. This tunic sweater is so good I have it in three colors.