Why does Tennyson most likely structure the third and fifth stanzas the way that he does in "The Charge
Brigade"?
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O
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to conclude the battle scene with an image of the aftermath
to clearly illustrate the experiences before and after the battle
to draw attention to the battle scene that takes place in between
to introduce the bold and courageous soldiers heading into battle

Gawain wears the green girdle as a token of his failure for not keeping his promise. He was supposed to give the host that he would give him whatever he gained that day, but he didn't give him the green girdle for fear that he would die. After being called out because of that, Gawain swears to wear the green sash for the rest of his life, and the Knights of the Round Table start wearing it as well after absolving him of blame.