Formal
Straight skirt in navy, grey or black with a classic blouse in soft shades of blue, lilac or pink will look good for the concert. Blouse with dress slacks also look good for women attending a classical music concert. A black colored stretch velvet gown with short sleeves and jewel neckline is another nice option to consider. A knit pullover with a boat neckline looks elegant. Accessorize yourself with stud earrings, a pendant and a bracelet.
Semi-Formal
If you want to be less formal in the event, go for a long or short velvet dress with a dressy blouse. Tuxedo pants also look good. Your skirt may go knee-length or a little lower. Slacks, jackets, blazers are also among the chosen semi-formal wears for women. Accessorize yourself with finger rings that do not have bright colored stones. Go for a handbag or you may carry clutch bags. Dress heels and strap-sandal come under the umbrella of semi-formal attire.