This is a crepe fabric, so less see through than the classic chiffon. It's also a narrow width, so rehearsal skirts will either be shorter - around 45cm - or  made in two parts.
 
waist options:
a slim 25mm double sided satin elastic in matching colour - or a contrast of your choice. Works well for smaller sizes.
 
For more support, a wider soft elastic black or white elastic, either 25mm or 38mm