Showering daily seems to be unhealthy; decreasing shower frequency would save time, and it might be easy to control body odor with antiperspirants. Here's an NYT article.
Relatedly, there exist forms of clothing that stay wrinkle- and odor-free for 100 days of wearing without washing, though at the moment a shirt costs $100.
Regarding the wrinkle-free claim for Wool and Prince, I found this to be true only up to a point. I took the company's advice at face value and would just throw the shirt into my backpack and go; after a while the wrinkles became pretty much permanent. No amount of dry cleaning fixed them. One should also watch out for stains as the shirts stain very easily. I was unable to wash out a grease stain. The coloration also faded over the 3 months I wore the shirt without washing.
Wool stills seems to be the best candidate for long use, little washing. I currentl...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.