
die Robe
robe
A long, loose, and often black official gown worn by judges, lawyers, prosecutors, or also university professors on official occasions.
Der Richter zog vor der Verhandlung seine Robe an.
The judge put on his robe before the hearing.
robe / gown
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robe
A long, loose, and often black official gown worn by judges, lawyers, prosecutors, or also university professors on official occasions.
Der Richter zog vor der Verhandlung seine Robe an.
The judge put on his robe before the hearing.

gown
A particularly elegant, formal, and usually long evening dress for women.
Sie trug auf dem Opernball eine atemberaubende Robe aus Seide.
She wore a breathtaking silk gown to the opera ball.
You can tell from the context whether the official gown or the evening dress is meant. In connection with professions like judge or lawyer and places like courts, it refers to the official gown. At formal occasions like balls or galas, it means the elegant dress.
Der Staatsanwalt trat in seiner Robe vor das Gericht.
The prosecutor appeared before the court in his robe.
In a legal or academic context, 'Robe' (robe) is often used with the verbs 'tragen' (to wear) or 'anlegen' (to put on). For example, people speak of the 'richterliche Robe' (judge's robe).
In vielen Ländern ist es Pflicht, dass Anwälte vor Gericht eine Robe tragen.
In many countries, lawyers are required to wear a robe in court.
When 'Robe' (gown) means an evening dress, it is often accompanied by adjectives that describe elegance and luxury. Typical examples are 'eine elegante Robe' (an elegant gown), 'eine festliche Robe' (a formal gown), or 'eine atemberaubende Robe' (a breathtaking gown).
Für die Hochzeit hat sie sich eine maßgeschneiderte Robe anfertigen lassen.
She had a custom-made gown made for the wedding.
dress
„Kleid“ and „Robe“ can both refer to a long, formal evening dress for women. „Kleid“ is the general, neutral term, while „Robe“ sounds especially elegant, formal, and usually very long. „Kleid“ works for a normal formal dress; „Robe“ can be the right nuance for a particularly magnificent evening gown.

Für den Ball wählte sie eine besonders elegante Robe.
She chose a particularly elegant gown for the ball.
Für den Ball wählte sie ein langes Kleid.
She chose a long dress for the ball.