Using a slightly brushed Cotton type black fabric these jackets have stripes that have been turned through as a back across the jacket. Half the strips have the brushed side of the fabric out and the other half use the reverse of the fabric which is a slightly more shiny side giving and interesting contrast between the strap.
This first jacket has the front looking like a normal jacket and the back consists of just the straps across the back so whatever is being worn underneath the jacket can be seen from the outside. So possibly a nice decorative floral fabric or something similar could be nice underneath...
This next jacket has the straps pulling a larger looser part of the jacket back in with a skewif type of gather being created and the straps have been continued onto the front where they would be just stitched down.