>>37872
The baby pants training pants are pretty well made. If you get the ones with extra padding and wear plastic/rubber pants over them, they can hold a pretty decent wetting (a bit more than goodnites I'd say). I suggest getting them a bit bigger than your usual size, since they can shrink when washing and drying them.
I also have a pair for messing, and they hold messes fairly well, much better than regular undies at least. Be warned that repeatedly messing them will stain/ruin them.