A comment on that video page 10 years ago was:

"The members in this version are Gregg Ferris, Kerry White and Jim Maguire, Hans was no longer with them."

So I looked up the discography info:

The Twiliters (3) – Creamsleeves (Greensleeves) which shows that the song Creamsleeves (Greensleeves) was written by Ferris, Maguire, White and the         
Vinyl, 7", 45 RPM, Single record was released in 1966.

It's the same lyrics posted here by GerryM. I had never heard the song or even heard of it but I was still in primary school and didn't discover records until a couple of years after that. I would have loved the song then and it's still funny now.