The fixation by conservatives that wearing a bra is a must comes from being conditioned by that individual by his environment. I see nothing wrong in not wearing one as having lived with my wife and kids, I know how my women folks hated having to wear them. From the viewpoint of a woman, having to be conventional meant doing something not natural. The reasons why bras needed to be worn is more for supporting those whose mammaries are very big and heavy and it is uncomfortable to be without one. Asian women usually have small ones and do not require support, so why bother?
What she should have done so as not to titillate or create waves was to wear something to mask her nipples. Anyway she really has nothing much to show apart from that.