Garments of widowhood
Garments that are worn by a widow, either as an indicator of her status as a widow, or as a part of the mourning process.
Key passages
Ge 38:14

So she removed the clothes of her widowhood and covered herself with the veil and disguised herself. And she sat at the entrance to Eynayim, which is on the way to Timnah, for she saw that Shelah was grown but she had not been given to him as a wife.

Ge 38:19

And she arose and left, and she removed her veil from herself and put on the garments of her widowhood.