If you are ever able to attend a Turkish Hamam or Baths, these shoes will be given to you to wear to keep your feet away from water.
While there are highly decorated ones used in the Hamam, they were also used in court and on the street.
The pictures are not really focused on the footwear, but they do not look to be decorated. Possibly just left plain for street use.
Republic of Turkey Ministry of Culture & Tourism– house dress.
Bath Clogs of the Ottoman Empire by Lisa Kelly aka Safiye al-Konstantiniyye. PDF document.
Feet and Footwear by Margo deMello. Down-loadable from Scribd.
The Bata Shoe Museum– Middle Eastern shoes.