What is the dress code for women in Istanbul?

There is no official dress code for women in Istanbul. It is a modern, cosmopolitan city where you can largely dress as you would in other major European capitals. 'Smart casual' is a good guideline. While you can wear shorts, skirts, and sleeveless tops, it's wise to pack layers like a cardigan or a scarf. This is practical for fluctuating temperatures and for respectfully covering your shoulders if you decide to enter a mosque spontaneously.