It would be very easy to sum up the denims in this segment as being dominated by Tencel and Lyocel cellulosic fibres from Lenzing. Yes, lightweight fluidity is essential for such big baggy denim garments which benefit from gathering, cinching, pleating and general volume controlling techniques. Both Tencel and Lyocel denim blends achieve the requisite fullness and drapey denims better than any other but they must share the stage with mid and light weight 2x1 fineweave twills and 1x1 plain weaves all sporting the old oe x oe vintage looks, which wash down amazingly displaying the hi/low shade effects at the twin needle seams. All of which lend an authentic appearance to what is in fact a fashion garment.
Is it a fashion garment or is it jeanswear? As long as it's indigo "Yes". Again in blends of Tencel or Lyocel depending on whether softness or slippy drape is required work best for such voluminous shapes. Creatively cinch at the waist and turn up the volume at the ankle or just let it all hang and flow. Feel feminine in these oversizes indigos. One cannot really call them all "denim" but as indigo they loosely fall into the category of romantic denims.
Volume does not mean big and ugly. Lightweights in fluid denims can be contained with big belts, pleats and buttoned tabs emphasising the body and shaping where intended.
Such baggy shapes are the antithesis of the currently ever popular skinny jean. The current imaginative volume hugs the body in mid and lighter weight denims, warmer for winter when back brushed, looking on-trend teamed with voluminous coats and wrapped up in the essential scarves.