For the record guys - I cited Cary Grant, Fred Astaire,& other greats as examples of guys who have valid opinions about style. Nothing to do with white shirts.. Here's a white shirt with linen- I like this kind of look. Today
You mean re: the navy pants? As long as it looks like a Summery fit, as opposed to biz-cas in worsted or flannel that says 'Suit' . Something with a wider hem and lower waist, say, in linen or light cotton.
Both you and Pingson missed my point, which was that about the only place navy pants are better than gray is when grays provide insufficient contrast i.e. with mid-gray SCs. For charcoal to work the jacket would need to be lighter IMO