A coffin, esp a cheap one: what they call in the army a pine overcoat (entry form 1896+, variant 1903+)
pine overcoat (1926+)
You ought to be wearing a wooden overcoat and you will when Uncle Sam lays his hands on you.
It was not sure then that monsieur desired the wooden overcoat?
"The man who comes after me will need a wooden overcoat," he promulgated.