Grace shared a lot of looks from behind the scenes on Batgirl in a new video she posted on New Years day. In one of the snippets, there is a shot of Grace in a costume, but it is not the Batgirl of Burnside-inspired costume that we saw in the movie. It looks like Barbara's last costume in the movie.
It looks like an armored version of the classic Batgirl costume from the 1966 Batman TV show, with padded gear and bright purple and yellow. It works as an upgrade to the Burnside-style look, which itself featured a more subdued version of a similar color pallet, and while a casual BTS shot isn't going to fully reflect how the suit would've looked shot and lit for the final film, it seems like for now This is the best we can get.
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