Depending on the pattern, a mosaic-knit fabric may be stiff and tense, due to the many slipped stitches; such fabrics may be better for coats and jackets, which do not require as much drape.
The stiffness and tension in a mosaic-knit fabric can vary based on its design; these characteristics make it better suited for coats and jackets, items that don't require significant movement or drape.