So that's how my bedtime conversation went with Preston. I emphasized the "dress-up" part, because at school they have a pretty dress that all the boys fight over when they are playing dress-up, and I'm pretty sure I mentioned dress-up when I was asking him about his Halloween Costume. But still, it's a pretty classic answer. I may ask him again tomorrow, just to be absolutely sure before moving forward.
By the way, I'm also pretty sure that the Golden Harp accessory is an a-typical add-on to his usual Princess dress-up costume, because THIS is what he considers to be a "Golden Harp" that makes "beautiful music." We play this harp a lot when we are cooking dinner together.