What you think it says: I'm cultured!
What it really says: I'm your corny white "African Studies" Professor.
Dashikis are not to be worn by anyone who is not West African, or else it's kind of disrespectful. The garment has a lot of history and culture surrounding it and it shouldn't be taken lightly. It also makes you look mad ignorant of black culture at large. In the same way not all Asians wear conical hats or kimonos, assuming Dashikis apply to all black people is also racist. The last person you want to be is the white dude who actively wants to look ethnic and celebrates Kwanzaa as a way to assuage your white guilt. The real world is not the "It's a Small World After All" ride where you can get on and off at your leisure.