This page says that Cousin Alvin sang MY GRANDFATHER LEFT ME HIS OLD BROWN PANTS on an early TV program called "The Old American Barn Dance" in 1953.

A reference book called "Country Music Records: A Discography, 1921-1942," by Tony Russell and Bob Pinson, lists a song called THE OLD BROWN PANTS, recorded by Frank Morris.

Here's a fragment that I pieced together from various "snippet views" of The Southern Folklore Quarterly:

GRANDFATHER'S OLD BROWN PANTS

1. * * *

CHORUS: How they did giggle! How they did yell!
Even my sister and my dear Isabelle.
How they did laugh whene'er they had a chance
'Cause grandfather willed to me his old brown pants!

2. One day my brother Bill went down to Grimes' old mill,
Took off his clothes and in the river went to swim.
Along came a billy goat, chewed the buttons off his coat,
Ate up his pants ('twas summer—they were thin!).
Now Bill was in a plight, had to stay there all the night;
I took his gal Mariah to the dance.
And as we passed him by, just to sympathize, said I:
"Don't you wish you had them old brown pants?"

3. Bill and Mariah wed, and the boys and girls all said,
"We'll surprise them with an old rag carpet bee."
Collars they were in demand, and the old pants came to hand;
While they ripped and cut, the jokes went round in glee.
My Isabelle the waistband tore; something rolled out on the floor;
"It's a thousand-dollar bill!" said sister Nance….