What does “wearing bangs” mean?
The contact sheet showed Baker scowling at the camera, wearing bangs that made him look like a nasty juvenile delinquent.

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Answer

It is a hair style. It means loose hair is hanging down in front of the forehead. Can you use Google Images? A Google Images search on the word "bangs" will explain it better than I can. When it is done intentionally, usually by women, it can look attractive. Here, it seems to be suggesting that this man just hadn't had a haircut and that it looked sloppy.

Here are bangs on a woman:

https://s-media-cache-ak0.pinimg.com/236x/88/df/39/88df392cf5887308677c5be0d040962c.jpg

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