We had friends over this morning which was all going fine until I realised my 4yo ds had gone very quiet upstairs. I went up to see what he was up to and found him dressed in my dd's clothes (nice skirt, top, knickers, tights etc). Actually a very well put together outfit!! This is the second time I have found him like this. He is very much a 'boy' but lacks male companions as he is the only boy in his age group at preschool. Is this normal?! Is it just curiosity? Any advice would be welcome.