Here is a brief quotation from The 2015 Best American Science Fiction & Fantasy anthology, specifically from “How the Marquis Got His Coat Back” a short story by Neil Gaiman:
In addition to its unusual pockets, it had magnificent sleeves, an imposing collar, and a slit up the back. It was made of some kind of leather, it was the color of a wet street at midnight, and, more important than any of these things, it had style. (134)
The metaphor used to describe the coat’s color stands out more than the other details because, even though it is a comparison, it is more specific: the street is wet at midnight. The other details include some information, but not particularizing information. The coat has pockets and those pockets are unusual, for example, but that language isn’t as interesting as the metaphor. It quickly stands in for the coat as a whole.
The coat and the main character’s desire to have it back reveals the marquis to the reader and provides a motivation. Seeking after the coat moves the story forward and provides the character with at least two problems to solve or be helped out of. The coat is useful in the story then, and you might use a similar strategy in one of your stories. But, in addition to this, Gaiman uses that interesting metaphor at least two other times in the story. Once he uses it as its own sentence, which surely highlights it: “The coat was the color of a wet street at midnight” (152). One of the character’s enemies is wearing the coat when that sentence appears. The metaphor appears again once the character has recovered the coat: “. . . the last of the flock wore a most magnificent coat. It fit him perfectly, and it was the color of a wet street at night” (156).
In addition to the ways the coat and the metaphor are useful in the story that have already been mentioned, readers remember it. The triggering of that memory when the metaphor appears again is pleasant in the way knowing or realizing something can be. This use of the metaphor is also similar to what some screenwriters call “superior knowledge,” when readers or viewers know or have information characters lack, but it is different in an important way. Having information characters lack can help us be concerned for them, but it also creates a difference between readers and characters. In the case of Gaiman’s story, because readers know the Marquis knows what his coat looks like—the color of a wet street at midnight—the information connects readers and the main character. The return of the metaphor joins readers and the character in contrast with superior knowledge while allowing them to be concerned for the main character.
Repeating the metaphor also allows Gaiman to mark important plot points. Finally, the metaphor acts as a refrain and repeating that refrain helps close the story.
Consider giving this a try.