While east coasters may have to hold off on this trend for at least another month, west coasters are smack in the middle of the rainy season, and the trench (which was, after all, developed as a lightweight alternative to the heavy coats worn by British and French soldiers during World War I) is the perfect splurge-worthy item of the season.
To work more than one trend into this look, opt for a denim trench like one from Derek Lam, or a white or ivory one like those seen on the Yves Saint Laurent Spring 2011 runway.