Body conscious jackets, nipped in at the waist, give a sexy spin to matched suits. One new twist on de-constructed stitching is the split seam. It does create a new looking visual impression, but the first time you try to work or sit down in a skirt or dress stitched like this, its's going to pull apart. There's no way those stitches can hold. They'll easily catch on drawer handles and other protruding objects, snagging or breaking the thread.
Sweater dressing, including the twin set, is the untailored alternative to a suit or sport jacket.
A shorter, hip-bone length sweater looks newer than longer ones, especially with fuller trousers. A gray cashmere sweater paired with a charcoal wool flared skirt is an approachable alternative to the gray flannel suit. Still, you may be smart to have a charcoal jacket handy for those situations where the third layer appearance of authority and credibility is essential. When approachable is the look you want, take the jacket off. For increased authority, put the jacket on.