Upon the passing of a loved one or individual of the Jewish faith, a mourning family will generally observe a shiva. During this time, it is common for individuals to show respect and support to the mourning family by making a “shiva call.” During this time, it is traditional to dress modestly in dark, subdued colors as a sign of respect for the family and the deceased.

When attending a shiva, it is appropriate to wear conservative, modest clothing. This often includes clothing that covers the shoulders and knees, such as a dress or skirt and blouse for women and a collared shirt and pants for men. Traditionally both men and women select dark, muted colors and tend to avoid bright colors and white. Some may also choose to cover their heads with a scarf or hat as a sign of respect. It is important to be mindful of cultural and religious customs and to dress appropriately out of respect for the grieving family.
When attending a shiva, a good practice is to look around the house to see if the family members are wearing any special clothing or if other customs are in place, such as the removal of shoes. When attending a shiva, a common practice is to dress respectfully.

Additional Reading:

Visiting a Shiva Home
How to Enter a Shiva Home
Sitting Shiva