1/2 yard single gauze (I used Nani Iro. You might find some if you dig around on Etsy. Double gauze would work as well.)
1/2 yard silk or silk poly blend.
Cut each in half across the grain, selvage to selvage (so you have two long pieces).
Trim so they are even (mine were about 8.5 inches wide)
Sew each set together (at the ends) so you end up with two very long pieces.
Trim to 72 inches.
Sew right sides together, leaving one end open.
Turn right side out.
Top stitch around the edges.