A hat wearing man probably wants three or four dressy straws in his closet for summer. That is fewer than he might feel necessary for cool weather, but then there are more hat colors in common usage during that latter time of year. For the sunshine he need consider principally shades ranging from the Montecristi Panama's ivory to the yellow tan of the Milan braid.
That said, men should not overlook the relatively inexpensive boater. London's Lock & Co. has one of lacquered plaited straw for a comparatively affordable £115.00 (about $175) and, despite the tradition of a century ago when men would throw theirs away at the end of each season, mine has given me good service for at least five years on golf courses as well as city streets without showing any stress.
Worn with a tropical wool suit in the world's most subtle white pindot, a linen shirt with a small houndstooth pattern, a linen necktie, linen pocket square and suede shoes. The tie looks too wide to my eyes these days but changing that will have to wait for spring.