And chance it's by Mycra Pac? I know Neimans and Nordstrom carry their things. I have two of their light-weight raincoats - short and long versions of the portrait coat on this link.
http://www.oohlalatx.com/page.aspx?page_id=85
Some of their heavier stadium coats I don't care for, but the lightweight coats and jackets are awesome because they're stylish, reversible (usually one side is solid and the other has a tone on tone design), don't wrinkle and come with their own tote bag so you can scrunch them up and put them inside to carry when you don't need them. ... and lucky me their outlet is a couple of miles away. For those in the Bay Area, the outlet sales are in June (just got a post card yesterday) and December.