The man in the photo is the relatively recently departed Keith Floyd, a flamboyantly dressed British celebrity chef and television personality known for his wit as well as a presenting style that included frequent consumption of a variety of alcoholic beverages.
I have written before about the effectiveness of analagous color schemes (those comprised of colors that are adjacent to each other on a color wheel) and here Mr Floyd illustrates one of my favorite pairings of blue and purple silks.
Purple and blue accessories are slightly unexpected so they contribute to the air of casualness that should always be about a man's dress. The combination works well with tan as well as gray jackets, as illustrated by Mr. Floyd, and the lighter shades are equally pleasant with navy.
The fish is unnecessary.