I really like this. I like how they've incorporated Steph's trademark purple eggplant coloring into the costume without losing the fact that the Batgirl costume is usually a darker colored one. I'd have to see more pictures, but I think I'm also liking the way the cape falls (off the shoulders). It loses me a bit with the thigh pouches, since that seems like it would be a pain to try and fight/run/whatever with that getting in the way, but Garbett's version of the costume at least makes the pouches less bulky. I'm still trying to decide how I feel about the exposed hair, but from an aesthetic point of view, I suppose it's kind of pretty.
On a whole, I think this costume works for Steph. I prefer how Garbett draws the costume to how Noto does it, which is probably for the best, considering that Garbett will be doing the actual art for the series.