I probably didn't look over it well enough. The black and white only colors made me think it was another costume, but it could just be a different colored version of the same costume.
I liked the Shadowcat moniker. I was first introduced to her as Shadowcat in Excalibur when the team went up against the dragons of the Crimson Dawn. Then a little later she started wearing a black cat suit with a mask that I found more visually appealing than the previous costume she wore.
I'll have to check out that costume. I missed a chunk of the X-verse from the time shortly after Kitty defected to Cyclops's team until around the time shortly after Jean was resurrected.