Explanation of the symbol. Could there be a greater humiliation for Judah and Jerusalem than to be compared to a rotting linen apron? The hard things said of this evil people in Jeremiah 13:10 must of course be understood with the limitations indicated in the note on Jeremiah 9:15, Jeremiah 9:16.
Imagination should (as usual) be stubbornness. The explanation in Jeremiah 9:11 is a strong argument for the rendering "apron" (see above, on Jeremiah 9:1).