2018 workrite coveralls weathering

Has anyone figured out a way to weather the coveralls yet? I have the pictures of the ones used to promote the film but I’m not sure what to use to get the grease stains and just grimy look. I figured I could use some sandpaper to rough them up some but to me they don’t look torn in any spot so I’m not sold on that idea. Any tips or ideas would be helpful.

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