Is this a bad idea?

Olivia has skipped her nap for three days now. I have no idea why. I am hoping it is a fluk and not a new way of life for us. Today's distraction was the big girl panties she found in her drawer. She fussed (despite "the sign") for nearly two hours because she wanted to put them on. I tried promising her she could put them on (despite the fact that she is not actually potty trained) after she took a nap - no success. So she's up. And she has big girl panties on. There is a pair actually under her pants - but the problem with that is that she could not see them, which is apparently the whole point of wearing big girl panties. So I had to put another pair on the outside...so she could see them. What would the potty training books say about that?