The Fit Styles for Dress Shirts for Men

Slim Fit tops are designed in stomach area, hips, and hands for a nearer, streamlined look.  It has nothing to do with being “slim” or “fat”.  If you like your outfits high, limited, and designed, you probably choose a thin fit.

Extra Slim Fit or Extremely Slim Fit tops are a more excessive edition of the thin fit.
Traditional Fit tops are cut more like a box.
Here is a good plan offered by store Streams Bros to describe the distinction between the different suits you might find  most outfit tops for men.