Maybe someone who has had a long and eventful journey. They put on their robe, which could be a reminder of their travels, and then start to tell their story. It could be a way for them to create a certain atmosphere, both for themselves and for the listeners.
Perhaps it means that by donning the robe, they are entering a state of comfort and relaxation, which allows them to open up and tell their story. It might be a story that is important to them, something they've been waiting to share, and the act of putting on the robe is like a prelude to this sharing moment.
It could be a fairy tale. Maybe a story about a brave knight rescuing a princess from an evil dragon. The robe might give you the air of a storyteller from olden times, and as you put it on, you feel like you're about to transport your listeners to a magical land.
It could be anyone really. A person who has a collection of interesting stories and likes to be in a relaxed state when sharing them. For instance, a traveler who has had many adventures and likes to put on a cozy robe in their living room after a long journey and then tell their travel stories to friends or family. Or it could be a teacher who wants to make the story - telling session more engaging for students by creating a bit of a theatrical element with the robe - wearing and then sharing a historical or literary story.
It simply implies that the speaker has the intention of donning their robe and then proceeding to tell a story. The robe could be seen as a symbol of comfort or a sort of ritualistic garment for this storytelling event. It might also suggest that the story is something personal or special, and the act of putting on the robe is part of the build - up to sharing it. For example, if it's a family story, putting on the robe could be like getting into the right frame of mind to pass on a family tradition through the story.
Well, you could start by getting comfortable in your robe. Then, set the mood. Maybe dim the lights a bit if it's an evening. And just begin with an interesting opening line like 'Once upon a time, in a land far away...' or 'There was a time when something extraordinary happened...'.
It depends. If it's relevant to the story and doesn't violate any legal or ethical guidelines, you might be able to. But it could also come across as forced or out of place if not done right.
She grabs my hat could be a simple yet interesting story. Maybe she grabs it because she wants to play a joke on me. She might put it on her head and make a funny face, and we end up laughing.