I do this quite often, as lately it has been very hard to afford diapers. I usually poop in my tight briefs underneath my pajamas, then go about my daily business sitting in it, doing chores, etc. In fact, right now I just made a giant, semi soft load in my tighy whities underneath my leopard print, onesie pajamas because I have the day to myself and plan to sit in it for hours, feeling like a child waiting to be changed.