If you read between the lines here, it all becomes clear. Basically the message in the song is simple; if you want to wear the punk overcoat, first you have to put it on. Now, a lot of people might think that the message in the song doesn't really need to be said, as most people who are considering to wear an overcoat (or any other garment for that matter) will automatically realise that they have to put it on in order to wear it, but things aren't that simple in the world of Woomble.
If you read between the lines here, it all becomes clear. Basically the message in the song is simple; if you want to wear the punk overcoat, first you have to put it on. Now, a lot of people might think that the message in the song doesn't really need to be said, as most people who are considering to wear an overcoat (or any other garment for that matter) will automatically realise that they have to put it on in order to wear it, but things aren't that simple in the world of Woomble.