This is the 11287th most frequent Russian word.
декольте
A low-cut neckline on a dress or top.
Here, 'декольте' refers to the style of the dress, indicating a low-cut neckline exposing the upper chest.
Она одела платье с глубоким декольте.
She wore a dress with a deep neckline.
In this context, 'декольте' is used to specify the depth or design of the neckline, with attention to social norms.
Величина декольте на официальных мероприятиях должна быть скромной.
The depth of the neckline at formal events should be modest.
Here, 'декольте' refers broadly to the concept of neckline styles and designs as a fashion element.