It isn't about how many clean clothes you have left, it's about how many clothes are dirty and need washing. I make sure that I have enough of everything to last me a week, if necessary. I used to get away with doing one giant load a week. But since becoming a father, I magically have to do two or three loads a day without exception. It's impossible to put it off without falling behind.
Fortunately we got a lot of hand-me-downs from friends. The one kicker is no matter what trick I use, the little guy loves to find just the right time to pee on me during the diaper change process
I started watching for when the diaper marks turned blue, then immediately change the diaper right after he peed so I can avoid being used for target practice. ;)