Jizo, Asakusa
Question:
Why Jizo Bodhisatva wears red bib??
Answer:
Red is considered a sacred color, purifying things or people, so it is used for various things, not only for bibs, but also for tori gates and structures in shrines.
Pic: http://www.senso-ji.jp/guide/img/sub_photo_chingodou01b.jpg