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As mentioned above, those are just glasses. There's been speculation if she stole them from Cheren, but they don't look anything like his glasses from the original Black/White.
Pretty sure they're just glasses. Though when you look at her:
it looks a little weird because the upper half of the glasses are practically non-existent for some reason. It might just be something to do with the art style, since it's the same with Cheren's glasses too:
Half-frame glasses are a style of glasses that actually exist. I guess Unova is just on the cutting edge of glasses fashion. Cheren and Bianca are just showing the different styles of half-frame glasses that are out there. Cheren's style is seen far more often for people who do choose to wear half-frames. I haven't seen ones like Bianca's in all the time I've gone glasses-shopping.