I'd keep it all fabric. Browse the upholstery sections for nubby rough textured things, remember that large patterns will disappear when cut into tiny strips, look at just the colors & texture. Look at the back sides too, the back might be a better solution that the front.
(I will also be using them too hold parts of the dress together).
While it seems logical in the construction phase, this is a quick trip to disaster. Build the dress on a bra or corset (either old fashioned or just off the rack modern type, long line bras work fine). By "on a corset" I mean literally, all aspects of the garment adhered to- very sturdily- and permanently. Let the base garment do all the work of both supporting the fabric, but also holding it where you want it.
All the swirls and swags and ruching should be done on a mannequin, pin, look at it, stitch it in place. Have your vines ready to go before you do that step and you can wrap, adjust, pin, sew, etc. repeat until done.
Can't wait to see it!