You will get a lot of different answers here but...I felt a bit out of place wearing white, khaki and bright colors in the ports in Europe - most of the women wear there wear pants or long skirts in subdued colors.
On the ship you will definitely feel comfortable in white in early fall.
No
September is beatiful climate in med. even in september especially greek isles and
the Tukey and white sorts are o.k.
regards
Nejat incedogan
Ephesus