Use soft brassiere pattern.

Materials

There are a lap robe (left) and a handkerchief (right) of the same type.
Needed only lap robe.
Another, thin stretch lace for straps and trimming.

Cut and Sew

1. Separate the lace of 2 sides.
2. Make 2 cups with the lace.
3. Cut the cloth in half.
4. Sew the sides of the bodice. Unseam the lace as slits.
5. Sew the cups to the bodice.
6. Trim the edge of the back with a stretch lace.
7. Attach straps of the lace.