In the Royal Ontario Museum, I found this armor, and was perplexed by the two gold rings that appear on the breastplate. While it seem that something ought to be attached to them, no example of samurai armor in the museum demonstrated this.

Wikipedia's article on samurai armor shows this component in a diagram, but there is no associated number or description (see the line immediately above the line marked "1").

My first thought was that some sort of banner would be attached to the front, but examples cited by the article refer to being attached to the back or shoulder.

Is there an explanation, or better yet, a picture of this component in use?