I have a child that has been doing underwear only at home evenings and weekends except naps/bed for about a month but a pullup over the underwear at my house for daycare. Same as if you expected rubberpants over trainingpants which is what we used before the days of pullups. She was off all last week and went full days with just underwear and I allowed it when she came back on Monday but I also knew that she had had her two weeks of being dry at my house as we did the pullup over underwear thing.