What is inappropriate dress in a flight

Saw this in news
http://edition.cnn.com/travel/article/thomas-cook-airlines-female-passenger-cover-up-intl-scli/index.html

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Discotheque · M

Anyone offended by what she was wearing really needs to get a life. She’s a teenager going on holiday on a plane, not a judge in a law court or a businesswoman in a meeting, nothing inappropriate is showing.