Carrara has all of the basic functionality to make clothes. A dedicated poly modeler can be faster, though, and there are various applications that have some extremely useful tools it lacks, particularly shrink-wrapping, dynamics, and UV relaxing. Hexagon has a good selection of tools that can make it faster in the hands of an experienced modeler. It is still not a complete solution, lacking the tools for dynamic drapery or mesh slicing. Silo gets a little closer, but has a different set of compromises. It all depends on your modeling style and preferred working method and workflow, as well as the kind of learning curve you face, and the personal budget you have to throw at programs. (Given the latter, I'd be tempted towards c4d, especially with the 3d painting plugins.) I find personally that the combination of Carrara, Poser, and a text editor is a straight-forward and not terribly confusing way to make clothing. (Oops. Better add a paint program in there for proper texturing!)