Faith's pink ribbons are mentioned three times in the first 6 paragraphs. Why does the author make such a point of this?

The ribbons are
symbols of Faith's purity and youth. They are decorations that a young, pure, faithful wife can
reasonably wear, even in Puritan society, and not be considered vain. Hawthorne mentions them so
many times to enforce the idea of Faith's purity. Asleaves her, he can still see her ribbons
blowing in the wind, and he is reminded, once again of her purity.

Later, he
recognizes Faith in the forest at the witches' coven meeting, and she has her pink ribbons
again, but this time they fall out of her hair, indicating that she has lost her innocence and
purity. This represents the final catastrophe to Young Goodman Brown, who has already seen his
father and several other supposedly upstanding, righteous people consorting with the devil. And
now, he sees his once pure and innocent wife.

Interestingly and mysteriously,
though, when Young Goodman Brown returns home at the end of the story, there is Faith, and she
still has the ribbons! So-- did he imagine everything? Is she still pure and innocent? That is
the intrigue of the story.