How to Say "black clothes" in Spanish
The Spanish word for “black clothes” is “luto” — B1 level.

Examples
La familia está de luto por la muerte del abuelo.
The family is in mourning because of the grandfather's death.
El gobierno declaró tres días de luto oficial.
The government declared three days of official mourning.
Ella todavía viste de luto, aunque han pasado dos años.
She still wears mourning clothes, even though two years have passed.
Describing the State
To say someone 'is in mourning,' use the phrase 'estar de luto.' You don't usually say someone 'is mourning' as an action verb like in English.
Using 'de' for Clothing
When talking about wearing black for mourning, use 'vestir de luto.' This specifically implies the cultural tradition of wearing dark colors after a loss.
Avoid using 'el luto' for the process
Mistake: “Estoy haciendo el luto.”
Correction: Estoy de luto (I am in mourning) or Estoy pasando el duelo (I am going through the grieving process).
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