Let me help, Sorcha.
From the Indies to the Andes in His Undies
(E. Burnett and W. Faber)

From the Indies to the Andes in his Undies
(is this also the first line, or just the title?)
And he never took a shave except on Mondays
He didn't eat a thing but chocolate sundaes
Twas a very very daring thing to do

And he carried for a charm a kippered herring
To protect him when the tropic sun was glaring
And whoever met him thought he needed airing

CHORUS (?) Otto Zilch, he's a hero of the ages
Otto Zilch, he will sure enter history's pages

FRom the Indies to the Andes, what a mission!
Stopping only now and then to do some fishin'
And he went without a copyright permission

He took a parasol that was his mama's
And crossed the mountains riding yellow llamas
Which he dressed in purple polka dot pajamas

Otto Zilch, He's the greatest navigator
Otto Zilch, Swam the rivers on an alligator

And he carried for a spare a pair of panties
But they didn't fit him well they were his auntie's
In his undies from the Indies to Andes
'Twas a very very daring thing to do