Spirit Airlines will remove passengers wearing certain or 'not enough' clothing

An airline has updated its dress code policy, banning see-through, revealing, lewd, obscene, or offensive clothing. The rules also apply to tattoos deemed obscene. Passengers must adhere to these rules, which are agreed upon when booking a flight. The policy change follows an incident where two women were removed from a Spirit flight for wearing crop tops.

What other behaviors could lead to being kicked off a flight?

What incident prompted the airline to implement the new dress code policy?