I ordered this for my daughter's 3rd birthday. She is bigger than the average 3-year-old and it fits her quite well, with a little room to grow. She typically wears a size 4T shirt. She really liked it and has worn it several times since her birthday. It is very attractive and seems to be of high quality. We have other Melissa & Doug dress-up clothes and really like them, too.

The issues we had with this outfit:

-The mask does not stay on very well. It keeps slipping down the back of my daughter's head.
-She can't put the outfit on by herself because it closes in the back (with velcro)
-The material will snag if any of the velcro touches it (which is states on the packaging, so be careful!)

Overall, though, it is very cute and she loves running around with the cape flying behind her. We will probably end up ordering the "Hero" set for our son on his 5th birthday, coming up soon. It was a good buy!