No, no, calm down, I'm not concerned that he is wearing dresses :) What concerns me is that he doesn't want us to see. He is 3.5 and he keeps grabbing his older sister's princess outfits but he won't wear them. When I ask him if he wants some help to put them on he acts all coy and says he only wants to do it when nobody is watching him 
Nobody has ever said to him that boys don't wear dresses and I keep saying to him "if you want to put your sister's dresses on, that's fine! It's fun to dress uo!" and he knows that it's not a big deal with us at all. So why does he act like he's doing something wrong?! I can't bear the thought that he wants to wear them but he feels like it's wrong - but then nobody has ever given him that impression so I can't see why he would think it. He doesn't really have any friends and he isn't at nursery yet so no other children would have said it to him either. He used to wear DD's outfits with no problem in the past, it's just these last few weeks.
Do you think this is just a silly phase which will pass or should I be concerned? My mum says I'm worrying over nothing and she's probably right but it's just niggling in the back of my mind.