From Margeh-75, a dramatic Witch dress. More for Halloween, but I like the jewel colours. Another, in an historical adventurer style, from Philosimy.
I found this online. It was for sale on Etsy but is no longer available. I think its a great idea for a necklace, or it could be made as part of a full dress/shirt.
Chicchatter87 has rosie sets include dress for Mother, child, toddler and infant. Also a sleeper for the infant. You can also download a bedroom set for a child or nursery for toddler/infant. Very pretty. I downloaded them all.
This dress is from Sandrini Feierabend. I like the roses in her hair too. You can also find a vampire hunter dress.
I would love to make a dress like this for my Sims, especially the Witches. Just add in a few pentacles and other symbols. I found this image online.