Weddingbee boards

I don't really know, but check out Miss Stripes recent post - she did a couple about the awesome menswear-inspired womens wear that she was contemplating, here and here.    I know she's in LA, but her ultimate choices are available online. 

And it's always possible to get a man's suit tailored to a woman's body. Depending on your figures, JCrew has some great mens suits that are a more slim cut and can be easier to tailor. 

What size are you (and what body type)?  I'm smaller (5'4) and pretty much straight up and down.  For my body type, I find that the Hilfiger stores, JCrew's suits (mostly - some of their jackets aren't padded well), and Charles Tyrwhitt tends to have great fit.  Otherwise, Brooks Brothers has lovely quality stuff, but you may want to take it in a bit - they tend to be slightly boxier.