premise: A woman in a pink tank top holds a plastic beer mug. hypothesis: A woman holds beer mug.
neutral: There isn't anything mentioned that isn't overtly mentioned before. A woman holds beer mug is the same as A woman holds a plastic beer mug. "beer mug" is more general than "plastic beer mug". If the sentences were reversed, you couldn't infer anything about her outfit, or that the mug is plastic.