So you want to bleach your denim? Cool. Do you have patience? Even better. I bought this Gap denim jacket at the thrift store in the spring with the intent of doing this DIY, however, when I got it home I decided I really liked it and didn't want to change it. Then, when I saw the photo above on the left from an outfit post, I realized I really didn't like this jacket as much as I thought and so it went to the DIY pile. I finally have gotten around to posting this, so sorry for the delay.
Submerge the denim in water until it's wet all over. Wring out and place on a flat surface.
Using an old Windex bottle, I filled it with bleach and sprayed the jacket. A lot. And when I say a lot, I really mean I ended up pouring bleach onto the jacket because spraying wasn't doing jack squat.
I used an old toothbrush to spread out the bleach I poured onto the jacket and brush it into areas.
I really focused on the seams. Once dry, I washed and dried the jacket.
Ta-dah! (more pictures here)