The tights on the size 4-6 were too small for my 4.5 year old (who wears @ size 5).  The dress fit ok.  So, I ended getting the 6-8 size, the tights fit (not too big at all), but then the dress seems too long.  I think I may try to put some fluffy paper in the hat to see if I can get it to stand/poof up a little bit.  Its cute, my daughter loves it, I just wished the tights would fit correctly.  The dress is thin like a summer pajama dress (just to give you an idea.