I recall reading somewhere that the appropriate time to wear whites is starting on Memorial Day with the cutoff on Labour Day (with the exception of tropical climates). Is this a fair guideline to follow? Also, I've been meaning to purchase a new pair of khakis, and I saw a pair that I liked retailing at a decent price. Then I noticed the exact same pair, except that instead of being 100% cotton, they were 55% cotton and 45% linen. I do appreciate the feel and breathability of linen, but is paying 50% more for them worth it?