You can write about a real coat or an imaginary one.
Maybe you will write about a coat of paint or a coat of sweat.
An imaginary coat would be any coat that you can think up. A coat that you could wear or would like to. Or a coat that couldn’t exist anywhere except your imagination.
An imaginary coat can have imaginary powers. Imagine a coat of confidence, reverence, pride…
If you finish writing about one coat and you still have room on the page, write about another one.
Illustrate your page if you like. When you have finished, write a title at the top. Put the date on it, too.