Wow, I thought I was the only one for whom that was the first thing to pop into my head! I hate this song (my mom had it on a 45 and she used to play it a lot when I was a kid), but…yeah. It’s about jeans. 
Fascinating useless fact, according to Wikipedia: David Dundas is *Lord *David Dundas, son of the 3rd Marquess of Zetland. The song was originally a jingle for a brand of jeans called “Brutus,” and the line was originally “I pull my Brutus jeans on.” The things you learn…