I've had poor luck at VS and at Macy's (used to be Lazarus here). Wonderful luck at Nordstroms. Apparently the old style of adding inches to your measured size to get your band size is not correct. VS had me in a 36D (funny, a size they do sell) and I measure at a 32DDD in Nordstroms. I am rather petite and the peope at Nordstroms had no clue why on earth they would put me in that size. My bras fit better, less back pain and the straps actually work right (not that you should use them for support, but they never fall now). I also feel like I look a little smaller than when wearing VS stuff.
I used to love VS, but their quality has really gone down hill over the last 10 years.