According to media sources from the twitter feed - this may have been the clothes in question?
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Note how the photo of the male figure is cropped.....
Her husband will be in for a shock if he tries to enter an Onsen in Japan as well from what I am led to believe.
If so - she probably got caught in the "head to toe" part of the gymwear rules, looks like more shades of grey pain coming for Qantas about differeing clothing rules and standards, especially with the recent fashion trend where they are trying to breakdown the divisions between fashion and "activeware" (which is just really give the appearance similar to the SUV craze where people want to appear like they have just come down off the logging track/mountain/cliff/gym/running track and come straight to the airport.)