same question goes for me - I want to develop my lats to spread wide so you can see them from the front.
The best exercises i know so far are:
Lat pull down (wide grip to chest)
Pullover
I usually superset these i.e. do lat pulldowns as normal, but when you finish the set immediately stand up, reduce the weight (to, say, 15kg), and start doing pullovers (with no rest). Pullovers being pulling the lat bar from its highest position down until it touches your thighs WITH STRAIGHT ARMS (important).