Whatever you want. This city is fairly relaxed about what people wear, be it shorts and tank tops, or fully covered.
I had heard that Adana was a “hot” city and maybe that’s why I see so many people in shorts and t-shirts.
Adana is sort of overlooked so people are left to do what they want and wear what they want.
And the locals are also warm and friendly like the weather. Except in traffic.