I too agree kids train best if in underwear or commando .... However I wouldn't allow it with out a a rubber/plastic pant over top for obvious reasons. I also agree in the beginning a child will not tell you they have to go because they really don't know. I always tell them it's time to go potty and I do get them to sit for several minutes because in the beginning it's not instant and I do it at certain times ... At arrival, before we go outside,when we come in , before lunch before nap, after nap. They get used to this schedule and when they go they get a sticker. After three straight weeks of success I up the ante and I start asking them if they have to use the potty and This makes them start taking ownership of their potty training and once they are successful with that I let them know they need to tell me and I stop asking .
continue from there