As the back piece now has nothing to hold it in shape, we will insert a box pleat later on.
Ensure you cut the back piece on the fold also.
With a measuring tape, measure the length from the shoulder to where you want the strap to end. I again used my bra as a guide and aimed to have the strap attach where my bra strap attaches to its back. Make sure you also mark these attachment points onto the back piece as we will refer to these when applying the facings.
Sew the facing on with right sides together around the arms, back and neck.
Leave the facing open at the strap insert point on the back and at the shoulders
As we cut them slightly smaller than the shoulder, they should easily insert into the hole, make sure you turn in the raw edge, stitch and press.
Cross the straps over, and insert into the holes in the back facing, and complete the top stitching to secure. If you didn’t leave a hole, that’s ok you can just stitch them to the inside.
Stitch to secure
Sew in a hem to the bottom and you’re done!!