All that is left to do is attach the straps in back! Lace it up and pin to fit. Then tack them on in back and trim the excess. (Note: it would be cleanest to inset them into the facing, but I got lazy;)
As an optional final step, you can add a modesty panel if desired in the back, which is essentially a strap of fabric which lies behind the lacing to cover up the exposed skin. I omitted that step for this one.