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If mandatorily shaving heads becomes an industry standard, then that industry is sick. In more ways than one.
Most organizations have a dress code. Even the other airlines must certainly have one, this is nothing out of the ordinary.
This is the only comment, unfortunately, which gets is right in this entire thread. Others are missing the point.

"itS inDusTrY pRacTicE" so what? The question is not about what is prevalent, but what is right.
Indigo themselves hype up the sex appeal factor. Their in flight magazine is called

"Hello 6E" and their ads regularly show leggy air hostesses in skirts.