Both: Six Of One, Half A Dozen Of The Other.

Susan: If They Don't Fit Right, I'll Give 'em To My Brother.

Both: But All The Same, Don't We Have Fun?
Half A Dozen Of The Other, Six Of One.

(not Sure Where The Next Line Fits In:)

Gordon: Not Much Money To Spend ...

(Somewhere In The Song, Susan Is Admiring Some Garment, And Gordon Sings That He Thinks She'd Look Just Perfect In It For Halloween. I Think The Last Chorus Goes:)

Both: Six Of One, Half A Dozen Of The Other.

Gordon: If I Don't Get This, I'll Never Have Another.

Both: But All The Same, Don't We Have Fun?
Half A Dozen Of The Other ...
Six Of One!