Perhaps the theme is centered around time as a precious commodity. In the short story, the characters might be living in a world where time seems abundant at first. But as the plot unfolds, they face situations that show them that time is finite and should be used wisely. It could be about how people waste time on trivial things and then regret it when they find out that time is slipping away faster than they thought.
I'm not sure without reading the story, but it could be an ordinary person who suddenly discovers they have all the time in the world and has to deal with this new reality.
The 'all the time in the world' story could potentially be a fable or a tale with a moral. It could be about a character who is lazy because they think they have all the time in the world, and then something happens that makes them change their perspective. For example, they might miss out on an important opportunity because they were too slow in taking action. Or it could be a story of adventure where the protagonist has all the time to explore a new world and discovers amazing things during their seemingly endless journey.
Since I don't know the exact story, I can't say for sure. But it could be a young adventurer as the main character if it's an adventure - themed story. Maybe someone who is on a quest and has all the time to complete it.
Perhaps he could be a very young child who doesn't yet understand the concept of clothing. Young kids sometimes prefer to be without clothes as they find it more comfortable or they are just exploring their bodies.
Some of the widely regarded best short story writers of all time include Edgar Allan Poe, Anton Chekhov, and Guy de Maupassant. Their works have had a lasting impact on the literary world.
There's no definitive answer. 'The Necklace' by Guy de Maupassant is often regarded highly for its brilliant character development and unexpected twist.
Another possible theme could be the power of perception. How one perceives things can create 'all the difference in the world'. In the story, characters might view situations differently, and this variance in perception drives the plot and the overall message of the story.
I'm not sure as the story isn't widely known to me. But typically, short stories have a few key characters that drive the plot. It could be a protagonist who is on a journey of self - discovery or facing a conflict.