Bicorn of general officer or field marshall without feathers

For purpose of comfort and economy, generals would wear hats without feathers or without embroideries and sometimes neither of them.
The cockade can be maintained with a oak leaves' braid (worn by Lassale at Stettin, see detail of painting) or torsades (Les invalides museum).
No issues with the colour of the feather which usually helps to identify the grade "général de brigade" or "division"
If you're going to be promoted.... no need to change your feathers!
Painting with different hats made during Empire, shows you how different could be officer's hats