I decided on princess seams and a full circle skirt, with long sheer sleeves. The main fabric is silk dupioni, fully lined with soft, soft cotton voile. I used regular serged and sewn seams on the voile on the wrong side, (which I put against the outer silk so it would be nothing but comfy against her skin.) and French seams on the dupioni to ward off fraying.
I also got some silk organza and had planned to do the embroidery myself, but found some leftover embroidered polyester organza that was enough for both sleeves and veil; I used the actual scallop on the bottom edge, and created a new shallow scallop edge all around the veil piece.
The final result: comfy, unique, luxurious and special.