I think it had elements of all Bronze Age dynamic -- V chest -- high collar, with a touch of Phantom Girl's Cockrum costume thrown in.
People have written that open chest and high collars was used for all of the black character introduced in the 70s, but it was not exclusive to black male characters (see Omega the Unknown, Nightwing, Karate Kid). I hate the bare legs and slippers -- which, ironically, I love on Supergirl in the early 70s (before she traded the slippers for boots). I will admit, though, that when Tyroc appeared on that Barry Kitson cover in the threeboot -- Tyroc looked really good. The white nicely contrasted his skin tone. I hated, though, how the characters from the cover weren't brought into the Threeboot (in general, I though Waid's run was very lackluster).