Your width is gentic-bone width can not be improved on. You can improve width in your muscles. Pull ups, wide and close grip pull downs are excellent for building your V shape via lats. Rows are great for building thickness/mass.
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Damn, its what I hate since I am 6feet tall and compared to other people I have relatively wider shoulder to shoulder but I have always wanted a really wide frame. I guess I will have to increase it via gym workouts.
Dumbell lateral raises are good for widening your shoulders. They even get taxed from heavy dumbell/barbell pressing too. Wide-grip upright rows can work your lateral shoulder head as well as your traps.
And also, like dg806 says, you can broaden your back which, with a small waist, can make you look broader.