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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Picklebobble2 · 56-60, M

Bit daft really.
I can understand flights wanting to ensure folk aren't sat there shirtless wearing thongs but that wasn't the case here.