Materials:
About 1 meter of 6 inch wide stretch lace.
About 1 meter of wide clear elastic.
Matching thread.
Instructions:
1) measure how long you need the lace and elastic. I made the elastic about 1/2 inch shorter than where it will sit above my boobs. The lace will need to be a couple inches longer.
2) Sew the elastic on the lace near the top edge.
3) Sew it into a tube.
Tada! Wonderful boob cover! Now I just need a black one...