Most women will wear normal business attire similar to that worn in a conservative american business environment -
Tops: It's better if the arms are covered, but if not then at least cover one's shoulders and ensure that the cleavage is not too visible.
Bottoms: Long skirts are OK but pants are a safer bet.
Outside of the office, wearing normal casual attire is appropriate - but again its' better to be on the conservative side (long skirts, etc).