Hi! I will be visiting Hong Kong and Shanghai in October.

And I am curious about what I should plan on packing for clothes and shoes, specifically what will be appropriate for both the weather and the culture? Are tank tops, shorts, and flip flops acceptable if it's warmer? Or would short-sleeved and long-sleeved shirts, jeans, and shoes like Toms be a better option? I don't want to be too hot or cold, but I also don't want to offend people over there by wearing something that is considered inappropriate or revealing.