Might try:
Pullovers..warm-up with a light BB or DB, working for a full stretch. 20-30 reps.
1) Bent arm pullovers....either DB or BB ( seem to get a better muscle action, for my self, with DB's but do which ever suits you.
2) Medium grip(little wider than the shoulders) chins, touching the chest to the bar each rep. If you have gymnstic rings at you gym then use them over a chinning bar. If your chinning bar has a set of hammer grips on it than use that over a regular chinning grip.
3) BB row..with a curl grip and the hands between 6-8 inches apart.. bring the bar into the lower abs each rep.
2 sets of 7-10 reps for each exercise.
Or
Bent arm pullovers....3 sets of 7-10 reps
Chins...rings or hammer grip prefered....2 sets of 7-10
The best insurance of getting any type of a taper will usually be through pullovers...either straight arm or bent. Not that it matter's that much, just an example, but I'll do a couple sets of heavy straight arm pullovers and than three sets of the bent arm version with DB's.
All forms of chinning are also great for the lat's. Don't see it much more but behind the next chins can affect the lat's and posterior delts very strongly also. Of course the bottom line is if your born with a potentional for a extra wide taper, but you can always make improvements. Good Luck.