This dress is from Romona’s LEGENDS collection (style L6139). It features a sleeveless sheath gown made of point d’esprit lace and featuring a planning, illusion v-neckline and a sheer lace back with button details; the gown has a fluted skirt and chapel-length train.
I have a video of how the bustle works and where the pins attach. I can also provide details photos or video upon request. Or meet in person if you are in the Greater Vancouver area in BC.