An addendum to the 'invisble facing' concept:
I like to have the 'out' side of many of my skirt/trouser waistbands match the fabric of the finished garment. It is not always desirable to have the same fabric on the inside face of the waistband due to bulk issues particularly when using wool flannel, wool crepe or in this case burn-out embroidered silk organza.
Sooooo, I customarily cut the 'outside' width of my waistbands in self fabric, adding about 1/2" to 5/8" seam allowance along the top edge and I cut the other half adding the same amount of seam allowance in a facing-appropriate fabric, say scrap silk taffeta, shantung doupioni, or in the case, a plain silk organza to match the hue dominant in the finished fabric (burn-out embroidered silk organza).
The result this time is a wonderfully stable, yet 'non-intrusive' inside waistband face.
How's that for 'gorey' sewing details? I have plenty more where this came from :o)!