My husband bought tickets to see the Tran-Siberain Orchestra at the AT&T Center?

I'd suggest wearing something nice but not overly formal (no evening gown or tuxedos required!). If you wear a nice dress with a shawl or sweater and your husband wears a casual suit and tie you will definitely not be the worst dressed people there but you won't stick out as overdressed either. There's really no dress code and you'll see people in jeans and T-shirts probably and some in Armani suits. Try to just dress nice and you'll fit right in. Enjoy the show, you're the one paying to see it.

Wear nice clean comfortable clothes. No perfume or strong smelling fragrances of any kind. No tall hats.

I'd avoid anything sleazy (it's Yo-Yo Ma, not Brittney Spears!) although it's a public place and you never know what you'll see.

I'm a guy and I'd wear nice pants and a button down shirt, maybe with a tie or nice sweater. And even if I wasn't San Antonio I'd wear my cowboy boots. Love em!

I went to a Manheim Steamroller concert (similiar to Trans Siberian Orchestra), in business casual and felt pretty over dressed.