Headscarf is the item would not allowed to wear into the Turkish parliament building.
Explanation
A headscarf is an item of clothing worn by Islamic women covering most or all part of the top including hair and head.
The face is not covered while wearing a headscarf. The purpose is to maintain privacy from non-related males and other elders.
It is a part of the tradition.
In the constitution principle on official secularism, the Turkish government has officially prohibited women wearing headscarves to work in public sector.