Sally Jupiter Costume (Silk Spectre I) from Watchmen

Step 11 Yellow Fabric: Making the reverse halter top.

Sew the edges of the fabric to protect from fraying, as this type of fabric can fray quite easily.  I hemmed all the edges for security.  (Do this in the same color as the yellow fabric, but don't forget to switch back to the black fabric before attaching this and the shirt to the belt and neck!)
I took two corners and pulled them together to act as the neck, letting the middle hang between.  I used this as the basis for the halter top.  I pinned the corners to the inside of the neck holes I left open for this part, and arranged the pieces the way I wanted them to lie against me.  I then pinned that arrangement to the belt.  I sewed the fabric to the beck and the belt (using black thread!!) and cut the remaining fabric from the belt.  

Make sure to reinforce the connection with another topstitch and protect the newly-cut edge from fraying with a zigzag stitch. (And, if you are as anal retentive as I, hem this raw edge.)