Melinda Cwrote a review of Louis Garneau Nova Women's Vest on March 12, 2015
Familiarity: I've used it several times
Fit: Runs small
Yep, it runs a bit on the small side. I'm 5'4", about 36D, and I bought a large. It fits comfortably over a serious sports bra (I think I'd have more trouble without that sort of compression) and a base layer, and I've also been known to add another lightweight layer underneath without any issues. Runs maybe a touch longer than I'd like for my height, but I'm not in this for fashion.
As for function, it does the job. Blocks the wind nicely in the front and dumps heat out the back like a champ. Consider this a wind layer only, and if you need more warmth, dress accordingly. The nice thing about that is that I can wear it through a broad range of conditions. I have the bright yellow, and it's truly obnoxious, which is a good thing when you're trying not to get killed out there. ;-)