H.W.
ok, so I am not the only one who has a nuddie, as we call it. My daughter will be 3 in January and when she goes on her own, she come out with nothing. We just help her put her underwear and bottoms back on a reminder her that that behavior is not appropriate.
I also am a mother to a now 7yr old who's "potty light" did not finally go off until he was close to 3 1/2. I went crying to the pediatrician, who also has boys...she told me about her youngest that was almost 4!!
It will happen, just be as consistant as possible and praise him when he does things they way you want/expect.