Ryan Ross wrote: “When I see a larger fellow with a smaller sporran, I'm always reminded of a codpiece.”

Good point.
Although the Scottish equivalent of the codpiece outfit is fitted trews (hose all the way up the leg, the tartan cloth fitted on the bias), and a sporran was occasionally worn with that kind of clothing.
Then again, the gentlemen who wore trews were generally mounted, and needed something more to cover their legs than the kilt. (Another thing that Mel Gibson got completely wrong in Braveheart!)
No doubt what you have in mind is a yob who doesn’t know how to wear a kilt, walking awkwardly, and making it worse by wearing a tiny little bag instead of a proper pouch or sporran.
Regards,
Mike