I like formal dressing AND casual dressing, but I'm not fond of the hybrid, dressy-as-you-like occasions like "creative black tie". Call it a costume party and I'm fine, but these hybrid occasions where some people are in skater-skirt tutus and others are in ragged, de-constucted jeans with tuxedo jackets aren't truly formal occasions in my books. Red carpet dressing where celebrities dress for shock and awe are also closer to costume parties than formal dress in my opinion. And office wear doesn't count as dressing up simply because I LOOK dressy compared to someone in ragged shorts.
But I adore dressing up for formal events where women are in ball gowns and men in tuxedos or dinner jackets. My first years at university included several formal balls complete with, long gloves, dance cards, and receiving lines. Formal wear was required and, as impoverished students, we traded formal gowns back and forth so we always had something "new" to wear. I was lucky enough to have a Mum who sewed so I had three formal gowns--a white silk fitted, floor-length number, a "winter" green velvet floor-length, and a black ankle-length lace overlay gown. I loved them all and was sad when faculties stopped the tradition of hosting formal balls.
I sometimes wonder if the desire for a big wedding with a gorgeous gown isn't, at least in part, born of the desire to dress up in true formal wear at least once in your life. Too bad it can't happen more often...