My trademark outfit/personal favorite will/would include:
A black leather trenchcoat, and either a white t-shirt w/ black and silver sequins in a skull-and-crossbones design or a big black T-shirt w/ the Meta's Symbol (from Red VS Blue) on it,and over that, a black and pink sleevless vest w/ white lighting bolts on the front & the word "Kuromi" on the front & a picture of the character on the back, jeans, black leather boots, plack fingerless gloves, and a black fedora as well as a pink band black bandanna or a black and white-checked scarf.
Of course, I have other t-shirst/outfits I like, but this would be my top choice.