Actually, I'm not very organized, which was the problem when it came to finding the right button. I don't have a sewing basket, I have a sewing closet, and I have thousands of buttons that date back decades; many of them I inheriterited from my mother. (I also never throw buttons away; those little suckers are expensive. Like a lot of people who sew, I often switch out the buttons that came with a garment for ones that look better on it, especially if the awful buttons were the only thing that caused an otherwise nice piece to be on clearance.

)
The thing of it is, I come from a family of very busty women; we're always losing buttons. I figured out in my teens that Murphy's Law dictates that when you lose a button it always happens in a public place.

Eventually I figured out that when it came to extra buttons, the only logical place to store them so that I could deal with such problems when I needed to was on the garment itself. I always carry a little TINY emergency button-sewing kit in my purse; it's a little capsule as big as a pen cap with two needles and three colors of neutral thread.