Clean shirt, new shoes, And I don't know where I am goin' to.
Silk suit,black tie, I don't need a reason why.
They come runnin' just as fast as they can
Coz' every girl's crazy 'bout a sharp dressed man.
ZZ Top had it right when they sang "Sharp Dressed Man". The Art Deco Society has a pretty good article about mens fashion in the 1920s in their "How to Gastby" article. I've taken the liberty of reposting the following image about mens suits (the articles really worth reading).
Sacque Suits were common and considered to be appropriate day dress for all men. The suits that had been worn before this time were big, broad-shouldered suits and since men were striving for the more youthful look, they began wearing suits that were skinnier and did not have padded shoulders. The suit pants also went through a change too. Creases became a big thing, they were found on the front of pants. Another thing added to pants were cuffs and they drew more attention to their shoes. Both of these things were added to pants to give off a sharper look. Belts were also becoming popular to wear with pants, instead of wearing suspenders. The belts were said to be "waist-slimming."
Putty, peach, blue-gray, and cedar were usually the color of shirts that were worn with sacque suits. Also worn with them, were silk ties. These ties usually had diagonal stripes on them or had different geometric patterns. Tie pins and black bowler hats also accompanied these outfits.
A Norfolk jacket is a loose, belted, single-breasted jacket with box pleats on the back and front, with a belt or half-belt. The style was long popular for boys' jackets and suits, and is still used in some (primarily military and police) uniforms. It was originally designed as a shooting coat that did not bind when the elbow was raised to fire. It was named either after the Duke of Norfolk or after the county of Norfolk and was made fashionable after the 1860s in the sporting circle of the Prince of Wales, later Edward VII, whose country residence was Sandringham House in Norfolk.
A gentleman wearing a Norfolk Jacket