Shaykh Muhsin al-Abbaad was asked the following question:
The turban or Shamaagh which some of them wear when praying. (Regarding it,) they (the wearers) let its ends hang when going into ruku’. Is this considered from sadl?
No, this is not from it because sadl is only in something that leads to harm. (An example) is like a person who has an upper garment, so due to sadl, it falls. As for a person who has on a Qamees, ghutrah, mashlah (outer cloak) and he does not hold back its ends or tie its ends, or he does not gather them together, then that does not affect [him or the prayer]
[Sharh Sunan Abi Dawood no. 86]
Faisal Ibn Abdul Qaadir Ibn Hassan