The Traditional or Classic fit is typically a little more generous in its form. Meaning that this fit allows a little extra room at the mid-section, and also has a slightly longer jacket. Ideal for the man that likes to cover more.
A Modern Fit suit is slimmer through the torso, with a narrower lapel, slightly shorter jacket, and flat front pants that provide a fantastic slimmer look. The greatest thing about a Modern Fit suit is that you do not have to be thin to look good in it- This fit is a look that can flatter all kinds of physiques. The body-contouring cut through the chest and midsection makes you look trimmer, no matter what your height or weight.
Slim fit suits allow for a slimmer waist in jackets and narrower pant legs at the hips. These types of suits generally apply to the slim man, however, it also applies to the men intent on the ultra-slim silhouette.
The Hybrid (or London) fit is a beautiful fusion of the Classic (Sierra) and Modern Fits. This fit allows a little extra room at the chest and mid-section of the jacket, yet maintains a wonderfully tapered silhouette.