Well, was it even really a helmet?
It's a bit of subdued colors compared to the purple but I think that does lend itself well to a Batfamily member and we also have her smiling in the promo art, so I don't think it's really "gloomy."
That and, as cited in Scott's interview, it helps with stealth.
Babs always has her hair exposed as Batgirl so I don't think this should be any less practical. It's probably not tied up because they want to showcase she's older then she was when she first became Batgirl with the ponytail.
Well, most of that is covered with this design .
I personally think Babs, if she's going to be in the same age range and experience level of Dick and has been purported to have been Oracle at some point, should be well past her college years at this point unless it's a deliberate AU where she's younger (which I sometimes felt like Burnside should've been).
I thought that was her Arkham Knight costume, personally.
I don't expect Scott to write towards 30-60 year old males with her run, but I foresee her bringing back a bit of an edge and seriousness to the title as it shifts away from Burnside.
Poor Babs constantly being stuck with makeshift costumes .