Sorry to be late to the thread, but the last couple of entries are hitting the mark.
'she could rag a tune, right through the knees of,
A brand new pair of Easy Breezers'

Easy Breezers, was a reference to a full union suit worn by 'the boys' in the military with a flap in the back, ergo 'breezers'.

Certainly the lyrics were altered to be more topical, thus BVD's or Levi's Jeans were introduced to subsequent versions.

In my opinion the Mills Brothers version is the best.