For the purple dress outfit you can use "skull print" but it will literally generate skulls on the image.
Default
BoaHancock, black hair, long hair, snake earrings, blue eyes, large breasts, hime cut, red crop top, cleavage cutout, center opening, white cape, epaulettes, long sleeves, red skirt, print skirt, side slit, midriff, navel
Purple Dress
BoaHancock, black hair, long hair, snake earrings, blue eyes, large breasts, hime cut, purple dress, china dress, sleeveless dress, side slit, popped collar