The story I heard about Bon dressing like a girl and Angus adopting the schoolboy costume was that it was to get the attention of hard drinking bar patrons at their gigs in Australia. The audiences weren't very reactive, and they tried several gimmicks to get them more into it. At one point Angus wore a gorilla suit.

Can't remember exactly- might have come from the "Let There Be Rock" documentary that toured shortly after Bon's death. Anyone else see it?

As far as fav song these come to mind:

Ride On
Girl's Got a Rythm
Whole Lotta Rosie
Riff Raff

"Ya see it on television every day
Hear it on the radio
It ain't humid but it sure is hot
Down in Mexico