I dreamt that I was going to a show and the main act didn't have their singer. Apparently I had sang a few songs with them before and so they asked me to fill in. Strange this is not something I would do in RL. They also had some outfits that I could wear that would make me look a little more rockstar. They were short fluffy skirts like found here. I think I ended up wearing two of them. The interesting thing was I wasn't sure that they size they had was going to fit...turns out that it did, it was a size 12. The whole dream was more about preparing more than the actually singing. I wasn't so worried about the singing on stage as being prepared and looking the part. The other guys in the band had these really cool colorful blazers on and I wanted to make sure that people couldn't tell I was a fill in for the show.
Apparently I thought I was cute enough, skinny enough and could sing well enough to pull this off.
Looking back it was a bit like what I remember doing when I was a kid, dressing up in front of the mirror and singing to my records(and yes, they were records back then!)