
das Dekolleté
neckline
A low neckline on a women's garment that leaves the neck, shoulders, and upper part of the chest uncovered.
Das Abendkleid hatte ein sehr elegantes Dekolleté.
The evening dress had a very elegant neckline.
décolleté / neckline
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neckline
A low neckline on a women's garment that leaves the neck, shoulders, and upper part of the chest uncovered.
Das Abendkleid hatte ein sehr elegantes Dekolleté.
The evening dress had a very elegant neckline.

décolleté
The area of a woman's body that becomes visible through a low neckline, that is, the upper part of the chest and the cleavage area.
Sonnenschutz ist auch für das Dekolleté wichtig, um Hautalterung vorzubeugen.
Sun protection is also important for the décolleté to prevent skin aging.
The meaning depends on the context. If people are talking about a garment ('das Kleid hat...' — the dress has...), it means the neckline. If they are talking about the body ('Haut' — skin, 'eincremen' — to apply cream), it refers to the body area.
Das Brautkleid hatte ein wunderschönes Dekolleté aus Spitze.
The wedding dress had a beautiful lace neckline.
When 'Dekolleté' (neckline) describes the cut of a garment, it is often combined with adjectives such as 'tief' (low/deep), 'weit' (wide), 'elegant' (elegant), or 'herzförmig' (heart-shaped).
Für den Gala-Abend wählte sie ein Kleid mit einem tiefen Dekolleté.
For the gala evening, she chose a dress with a low neckline.
When the body area is meant, the word is used like other body parts. For example, you can wear jewelry 'auf dem Dekolleté' (on the décolleté) or care for the skin 'am Dekolleté' (on the décolleté area).
Die Kette lag perfekt auf ihrem Dekolleté.
The necklace lay perfectly on her décolleté.
chest / breast
Brust and Dekolleté can refer to the upper front area of the chest. Brust names the body region in general and in a more anatomical sense; Dekolleté refers to the part made visible by a low neckline. Brust is the appropriate word for the body part, while Dekolleté is used for the visible area created by a neckline.

Der tiefe Ausschnitt ließ ihr Dekolleté sichtbar.
The low neckline left her décolleté visible.
Der Stoff bedeckte ihre Brust bis zum Hals.
The fabric covered her chest up to her neck.