..."you can make your own entertainment for free with your flies done up".

Jack Campin, I know this is tangential to what you asked, but what does "with your flies done up" mean?

I'm sorry, but the first thing I thought of was a man's pants were unzippered and some woman whistled at him, but that would be "with your flies down".

Or maybe that was a typo and you meant to write that people were whistling because they feel happy cause they done finished eating french fries that come with a McDonald Happy Meal...

Naw. Probably not.

Okay. Maybe you mean that all the flies that people use when they are fishing are used up {or "done up" as you phrased it}. So the fishermen or fisherwomen don't mind whistling cause they are done fishing and their whistling won't scare the fish away. {You can see from this example that I know absolutely nothing about fishing. People use flies as bait, don't they? And they have to be quiet when they fish, don't they or else the fish will know that they are there. If not, scratch that possible meaning.

Better yet, let me just say that I don't have a clue what "with your flies done up" means. And when I say I don't know, I'm not just whistlin' Dixie.

;O)