Oh, I just like this word so much

I like this word: décolletage.

So what does it truly mean, and where does it come from?

(Of course, there will be an instructional illustration.)

dé·colle·tage (dā′kôl-täzh′)
n.
1. A low neckline on a woman's garment, especially a dress.
2. A dress with a low neckline in front.
3. The area of a woman's body that is exposed when a garment with a low neckline is worn.
[French, from décolleté, having a low neckline; see décolleté.]

So there you have it, definitively. Now for the illustration.

I knew there was a reason I liked this word so much. Thanks to Michelle Keegan for the visual demonstration of its meaning.