The old dressing gown represents his old life. It is plain as is Akaky Akakievich. He never does anything even halfway exciting. Most of the time he sits around copying things to practice for his job, which is by coincidence being a copier. The old coat is boring and so is Akaky Akakievich. His agenda is normally get up and go to work and then come back home and go to bed. The old coat is about to fall apart as is Akaky Akakievich. However, he is about to fall apart mentally the coat is falling apart physically. Akaky Akakievich is going to fall apart mentally due to the extreme amounts of teasing he endures at work from all of his colleagues.
The new overcoat represents his new life. This new coat is shiny and polished up and makes people respond to Akaky Akakievich now. The way people respond to him is a warmer more comfortable way. Just as the coat is too him, warm and comfortable. Akaky's promotion may have to do with the fact that his new overcoat cost a lot of money and a more important position is cause for a more respectful look. The new overcoat may have been foreshadowing for him getting the new promotion. A loser like Akaky Akakievich with such a nice overcoat sounds a little bit "fishy." This may have implied that he was going to be moving up in the world, which eventually did happen.
The symbols affect the plot and some of the characters of this story. Plot is affected because at the beginning of the story it is about a boring, unpopular, lump of unattractiveness. This plot then quickly shifts to a story about a well-respected and fun loving man. This is a complete transformation of themes in a matter of