Depends on weather/activity...one of several ball caps (especially shooting, as they work well with ear protection), a tigerstripe boonie, or on my drizzly outing last week, my Stetson 'Sturgis' crushable wool hat...
Really like the Stetson for cooler/rainy conditions where I'm not off too deep in the puckerbrush...nice, practical, functional with a touch of class without being too 'honkytonk.'
BOSS