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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Krishh · 46-50, M

Airline apologize and the Morning Show

https://www.today.com/style/thomas-cook-airlines-apologizes-dress-code-crop-top-incident-emily-t150539