A really simple was to spice up a basic blouse is to give it an open back. The possibilities for this DIY are endless.
What you will need:
Needle & Thread of your choice
A good pair of scissors
First, you'll want to figure out where you want your slit to begin and end. You then want to mark those areas. Secure a button and loop at the top of the blouse (optional), then cut it as large as you want. Next, fold each side of the cut under and sew into place. This will open the slit so that it is more noticeable.