It's not about the "culture", it's not about religion neither, it's about politics. If Qatar wanted to, they could have let anyone be anyway they want, there was a woman who got famous (and that was her aim) by wearing clothes Qatar didn't want, and they didn't jail her for it, nothing really happened to her, which shows that they can let it be if they want to, did anything happen? But, I can guarantee you that there will be more people like that on the next one.
~
It is a controversial issue to compare Qatar with other Islamic countries - it is too rich a country and in fact there can be at least Islam, at least belief in aliens - there is no tension between different segments of the population because everyone is more or less rich. Now imagine a poorer country where religion is traditionally used to oppress the population. When holding such an event as the World Cup and such women (as I understand you were talking about that Croatian model with impressive forms), there can be an explosion from both fanatics and those who want a non-religious state and civil liberties.