Maybe someone saw this before me, but in James Bond Jr. a villainess named Barbella has her outfit inflated by "hyper helium."
She's actually a bit muscular in terms of appearence (clearly a female Arnold Schwarzenegger parody), but a female character nonetheless. I love how round her outfit gets, and the pop afterwards. :-)
http://www.youtube.com/watch?v=W0RrKR4D03E#t=1m36s
Definitely didn't see this as a kid.
Long ago I heard someone mention this scene but it did not surface at the time. Nice that you found it!
However, it took me a while to realize the one in gray was a girl...
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