My take on this contest, and you can correct me if I've interpreted this wrong, is that the slave Leia outfit is really iconic and really popular. While in story, it's about Jabba's power and control, it's on the cover of the Jedi poster and DVD cover, it's cosplayed at conventions, it's on t-shirts, it's probably one of the most popular if not the most popular depiction of Leia. So, let's take that iconic costume, and let's see what creative ways people come up with to keep the overall colour scheme, patterns, etc and re-design into something that's not a slave bikini outfit. It's for fun and to test creativity and to see if the overall aesthetic style of the design can be kept while changing other things about it (like ze-tarts did with the fully clothed superheroine designs). At least, that's how I interpreted it.