Is it permissible to wear black as a sign of mourning for the deceased, especially for one’s husband?

Praise be to
Allaah.

Wearing black at times of calamity is a wrong custom that
has no basis…  When disaster strikes, one should do what is prescribed
in Islam, which is to say “Innaa Lillaahi wa innaa ilayhi raaji’oon
(Truly, to Allaah we belong and truly, to Him we shall return)” [al-Baqarah
2:156 – interpretation of the meaning], and “Allaahumma i’jurni fi
museebatini wakhluf li khayraan minhaa
(O Allaah, reward me for
my calamity and compensate me with something better).” If he says that
with faith and seeking reward, then Allaah will reward him for that
and compensate him with something better. But there is no basis for
wearing a certain kind of clothes, such as wearing black etc. This is
a wrong and blameworthy practice.