Finnish to English Art/Literary Poetry & Literature

Here's the whole sentence: "Hän otti taisteluhattunsa, mokomankin sarkataitelman!"

The context is a description (with some humor, although the main purpose is the history, not the humor) of Napoleon dressing for a meeting with another head of state. He just determined that a crown would not do ("darn, left it in Paris..."), so he's settling for his normal field päähine. Obviously I'm not looking for a literal translation...unless you can make it work!