Use the Wire Frame shader settings to draw objects using their wireframes.
Wire Frame shader settings
You can adjust the size of the wireframe using the Line Width field. The wireframe uses the material color from the Material settings.
The following example shows the effect of a Wire Frame shader appended over a Flat shader. The wireframe has a Line Width of 2.0.
A Wire Frame shader is appended to the jacket with a Line Width of 2.0.