Posh Clothes Advice Needed please!!

[serenity]

DH is taking me to see The Nutcracker at the South Bank Center on Saturday as part of my christmas present (very pleasant surprise indeed!)

I have never been to anything like this before, and I have no idea what to wear. I'm presuming it's not going to be anything ridiculous like black tie/long dress (which is not in my wardrobe } but not dress down to jeans etc?

Is it smart/casual? What is smart/casual?

Help - I'm really looking forward to the night out, we do it so rarely and normally nothing like this, I want it to be special......

This is rapidly spiraling out of taste boundaries I think.

Back to the trousers/heels/nice top combo I think, and I'll spend the next couple of days persuading DH that black trousers/shirt might be a better look for him.

When I was a music student we used to get the unsold tickets to things at about 5pm on the night of the show. No time to go home and change so I frequently sat in the most expensive (and therefore difficult to sell) seats in my Dr Martens, vile baggy leggings and enormous T shirt. Always ended up next to people in full evening regalia. I was a little embarrassed, but never so much that I kept a nice set of clothes in my locker!

Just to say thanks again.

I had a really great time, DH only nodded off once (but we had stayed up until 3am the previous night) and even he enjoyed it enough that he's happy to go again to see Romeo and Juliet in a couple of months.

Lots of kids, but I didn't spot any Barbie dresses sadly - lots of jeans though!