When in doubt, wear all black. I'm not gonna play like I invented that, or that I read it somewhere and a lightbulb went off in my head. I see articles written constantly on the power of wearing all black, but there's more to it than just throwing on your best blacks.
Like, do they even match? The best way to solve that problem is to make sure that every piece is a different fabric. I combined whatever a suit jacket is made out of with whatever this blouse is made out of and whatever these leggings are put together with, and voila. BLACK MAGIC.