Is wearing black in two months of Moharram and Safar Mostahab or Makroh? The Grand Ayatollah Sistani’s answer

The Grand Ayatollah Sistani answered a question about wearing black in two months of Moharram and Safar.

Question: What is the ruling about wearing black in two months of Moharram and Safar, is it Mostahab (recommended) or Makroh (inappropriate)?

The Grand Ayatollah Sistani: It is an appropriate and acceptable act and its Keraha (inappropriateness) has not been proved.