Waist band: use serger to sew each end of the waist band together. If you don't have a serger use a zig-zag stitch and make sure it hangs over the edge of the lace.



Crotch: use serger to sew along the line of the pins. BE CAREFUL make sure you are doing this on the correct side. What ever corner the pins curve to you want to sew on that side of the pins (see image). If you don't have a serger first cut on the side of the pins you would have sewn on the serger, then use a zig-zag stitch and make sure it hangs over the edge of the lace.



The end of the crotch piece that gets wider will be on the front of the panties.



I provided images so you can see how the individual pieces turned out.