Polygons with transparent fills and solid outlines

I need to create polygons with transparent fills and solid outlines. I can do this by superimposing the same poly over itself on a separate layer so that the bottom layer is a transparent fill with no outline and the top layer is an outline with no fill.

I'd prefer to do this using only one layer. Using two layers creates two items in my legend, neither of which provides an accurate visual example of the poly in the map.

Any suggestions?

Thanks,
David Lanham
Lanamation LLC