| Sometimes I want to trace a pattern that has such light ink that I can't see through the lines through my tracing paper. The Big 4 often have lines where the ink is barely visible.
I lay my freezer paper on top of my cardboard cutting mat, (or just a piece of fabric between the pattern piece and your cutting table works, too) lay my pattern piece on TOP of the freezer paper, and trace around with my serated tracing wheel. The little serated teeth make a dotted line that is easy to see on my freezer paper.
Using tracing paper in between works, but this way you don't have to lift your piece to reposition your tracing paper and risk moving your pattern.