
das Revers
lapel
The folded-back, upper front part of a suit jacket, coat, or jacket.
Er trug eine kleine Blume am Revers seines Anzugs.
He wore a small flower on the lapel of his suit.
lapel / written undertaking
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lapel
The folded-back, upper front part of a suit jacket, coat, or jacket.
Er trug eine kleine Blume am Revers seines Anzugs.
He wore a small flower on the lapel of his suit.

written undertaking
A formal written declaration of obligation or promissory note, especially in diplomatic or legal contexts. This meaning is rare.
Der Diplomat musste einen Revers unterzeichnen, in dem er sich zur Einhaltung der Bedingungen verpflichtete.
The diplomat had to sign a written undertaking in which he committed himself to complying with the conditions.
'Revers' is a loanword from French. This explains the spelling and pronunciation, which are unusual for German words.
Das Revers dieses Mantels ist aus Samt gefertigt.
The lapel of this coat is made of velvet.
You can easily recognize the meaning from the context. If people are talking about clothing such as 'Sakko' (suit jacket), 'Anzug' (suit), or 'Mantel' (coat), it means the lapel. If the topic is legal or diplomatic documents and verbs like 'unterschreiben' (to sign), the rare meaning of a written undertaking is meant.
Er steckte sich eine Nelke ans Revers.
He pinned a carnation to his lapel.
In its main meaning, 'Revers' (lapel) is often used with the preposition 'an' or 'am' (an dem). Typical adjectives are 'breit' (wide) or 'schmal' (narrow).
Die Mode der 70er Jahre war bekannt für breite Revers.
The fashion of the 1970s was known for wide lapels.
The meaning as a written obligation is very rare and belongs to elevated official or legal language. In normal everyday life, you will hardly ever encounter this meaning.
In dem historischen Dokument fand sich ein Revers des Adeligen.
A written undertaking by the nobleman was found in the historical document.
collar
Der Kragen and das Revers both belong to the upper part of a jacket or coat and lie around the neck or across the chest. The Kragen surrounds or frames the neck, while the Revers is the folded-back front part below it. So use Kragen for the area around the neck and Revers for the folded-over front section.

An der Vorderseite des Sakkos war das Revers sauber umgeschlagen.
The lapel on the front of the suit jacket was neatly folded back.
Für den kalten Morgen stellte sie den Kragen ihrer Jacke hoch.
Because of the cold morning, she turned up the collar of her jacket.