Oh yes...BCBG is practically the ONLY place I would go for elegant dresses that you can wear a few years down the road...
However, I did find a few less formal dresses that you can pass off as grad dresses at Armani Exchange on Robson (personally I find that the formal prom dress thing isn't vry classy b/c everybody looks the same...so I would just get a fancy dinner dress and accessorize it)