In one of the old picture albums that are in my possesion, this picture of my father appears. It's made on Queens Day, 30 April 1963. He's dressed up as a minister for the parade.
My father told me that there was a theme each year that his school class dressed up as, and that year it had been a song. He'd been the minister in the song and there were many other characters named in the song, and the rest of the class had dressed up as those characters. The song itself was an old Dutch children's song. We both knew a sentence of it, and we could hum it, but for the life of us, the rest of the lines, or the title, escaped us.
With the faint hope that I might find something, I entered the two sentences in Google. And look! It spit out the exact song we couldn't remember! It's called Catootje. If you want to see it performed (with English subtitles!) you can watch it here.