I always wear something I don't get to wear anywhere else. Time to dig out the fantasy-life clothes! One performance I attended, I wore a basic black Ann Taylor business suit, with a pink satin and black lace cami peeping out from underneath, high heeled pumps, and these stockings. I love these stockings and never really have any other occasion for them, besides playing dress-up for ballet or opera.
http://www.ebay.com/itm/VICTOR.....-18-00-/30
I also have a nude-colored Michael Kors pencil skirt that is entirely sequinned, that I wear with black tights and a black turtleneck, and heels. And a purple silk 50's type skirt from Anthropologie that is beaded all over, and has several layers of tulle underneath. Again, I wear that with a simple black turtleneck, and sheer black backseam stockings and heels.
I have two more fantasy-life outfits waiting in the wings: a black Tracy Reese beaded suit - pencil skirt + jacket. The skirt has a very discreet pleated pink ribbon trim around the bottom. I haven't worn it yet, but it's waiting for the next fancy dress-up occasion. And a vintage Lillie Rubin cream-colored, long-sleeved, knee length, 60's dress, with a heavy nude mesh cutout/insert at the waist, that is beaded and spangled all over with heavy rhinestones and jewels. It looks kind of like something you would wear onstage in Vegas, or an episode of Mad Men and I'm finally small enough that it fits. (It took five years to get to this dress!) I plan to wear that to the Brian Setzer concert in December.
Sorry for the long post. Can you tell I get really excited about fantasy-life clothes?
p.s. - my general rule of thumb for these occasions, is that one item gets to be the 'show pony' of the outfit, and everything else has to blend or fade into the background as the supporting cast. Otherwise, the potential to look like a crazy, costumed person increases exponentially.