Style is the Silhouette of a Garment
Silhouette is outer shape (outline) of a garment. Designers choose a silhouette and come up with new designs by using new fabrics, new colours, manipulating fits, varying lengths, different methods of detailing, fabric manipulation, newer ways of garment construction.
Visual Impact of a style can be changed by use of fabric with varying drape value.
Example: A-Line is a Style as the Silhouette is like an 'A'. But within the A-line, details may vary from one garment to the other, the length of the garment may be short or medium or long. The fit may vary; skin tight, close, comfort, loose. The outline will remain in the same irrespective of the fit and length.