A number of fit women have something similar to "love handles" (not sure how to call it; see the pictures) in front of the torso near the underarms. They are visible when strapless dresses are worn.
What muscle should one work on to make them tighter? (could you give the exact name of the muscle(s) that are around this area, if possible?) What would be the best exercise(s) to do so?
Edit: this happens to fairly skinny women with no "love handles" around the tummy whatsoever, so I presume it's not the excess weight problem.