This is a set of three: skirt, shirt, and stockings, from Birba32. I think you could have them worn together or with plainer clothes if the set is too much colour all at once. I think its fun, especially for kids.
This is a bit Halloween looking but still fun as an outfit for toddlers, dress and leggings. Little Witch From Paogae. See also for grown ups: New Witch, a dress as a Halloween costume. SexyWitch, but it looks almost the same to me.
Alice in Wonderland Raggedy Ann and others.