Hello Kristin, thanks for your question:
1. Yes, it is purple, and since there is spot light used when taking product photo, so the actual costume color may a slightly different from the photo.
2. if you order custom size, our tailor will make the costume size for you as your custom size requests, so ordering custom size will be the safety way.
3. there is no pannier / petticoat / hoop skirt included, of course, using a hoop skirt or
pannier will present the best cosplay look. (^_-)d