Why does Dove's advertisement always have a piece of brown silk bypassing the actor's shoulder?

Dove's advertisement must be to promote the silky feeling of Dove's chocolate, so he used a brown silk to cross the actor's shoulder. This medium-colored silk is actually an extension of Dove chocolate, that is, its extension comes from this very brown silk, because let's take a look at this thick silk, which is very smooth and soft, just like after we eat this chocolate, so this is a propaganda meaning.