The Police Files, when they're asking John Ramsey about what Patsy wore the night at the White's, he responds a red sweater. (I can't find the exact quote right now, but I read it earier tonight, and that's what he said). So...did Patsy have a red sweater on under the jacket, and perhaps took the jacket off at one point? Or did John just remember she had something red on? John's response at the earlier interview might have been why they wanted to pursue this line of questioning, and why jacket vs sweater is mentioned.