mourning clothes; mourning attire
Clothing worn to express grief at a funeral or during a mourning period. In Japan, typically black formal wear.
I will go to the funeral wearing mourning clothes.
She was wearing black mourning attire.
She wore mourning clothes and attended the funeral.
I changed into mourning clothes before the ceremony.
喪服 refers specifically to mourning attire worn at funerals, whereas 礼服 is the broader term covering any formal dress, including weddings and ceremonies.
喪服 is the black mourning clothing worn to a funeral, while 喪章 is just the small black ribbon or armband attached to clothing to signal mourning.
Compound of 喪 (mo, 'mourning') and 服 (fuku, 'clothes').