Yeah... One might expect the largest Pull-Ups to be equal to or larger than size 6/7 diapers, but they're actually a good deal smaller! Easy-Ups are a little larger than Pull-Ups and much, MUCH stretchier. If you have a strong urge to try training pants, those will be your best bet. They'll ride pretty low, though!
You take a towel fold it in half, by length. Then food it in half two more times the other way. Then stick it in a pair of panties/underwear and then use some plastic panties or a trash bag tucked into the undies.