The REI eVent house branded rain jacket is nicely made and does come in larger women's sizes than most jackets. I've worn one most of the times that I've been on the water this fall/winter:
REI Kimtah Rain Jacket - Women's - Free Shipping at REI.com
They come on sale a few times a year and then are in the $150 range (about 25-30% off).
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior