Dress appropriately
Because Turkey's population is 99 percent Muslim, religious beliefs are likely to impact much of the daily behavior and customs you'll encounter, whether in modern cities or traditional rural towns. This does not mean that women coming to Turkey must cover themselves from head to toe, but understanding correct etiquette and dressing modestly might help you avoid unwanted attention.
A scarf is the ideal multi-purpose accessory. If you're feeling exposed or the temperature decreases, you can drape it around your shoulders. When entering a mosque, use it to cover your hair and put a bag in your handbag to carry your shoes — you'll have to remove them to enter.
Turkey is greatly influenced by Europe and hence has a rather flexible dress code. Unless entering a religious location or certain conservative communities, women are not required to cover up. In general, modest everyday wear will suffice; however, dress a little more formally than you would at home.