This costume is not just a one night use.  Once we received it in the mail, my two year old began playing with it right away.

Sizing- My daughter wears a 3T / 4T, we bought the size 6 and I would not want it any smaller.  Fit her great and she has a little bit growing room.  The way the costume is designed, it is okay if it is a little big.  When I ordered the 6, I was so worried it would be too big, but surprisingly it was perfect.

One problem (but a small one)- My daughter was able to pull the felt "SD" dog tag off of the collar.  I knew when I put it on her the first time, she would probably pull on it enough that I would have to reattach it eventually.  Well the felt stretched quite a bit before it separated at the collar and disconnected completely.  I had some thin yellow grosgrain hair ribbon and I made a new loop with it and attached it back onto the collar.(I have poor sewing skills, this was done with needle and thread, easy and fast)  This way it won't come off again.  Couldn't tell I had made the repair/ upgrade and my girl could has been dressing up as Scooby Doo since, with no problem.

I don't fault the costume for this small issue.  Kids are destructive, especially 2 year olds.  My poor leather couch has suffered damage, but I don't fault the couch maker.  Kids will be kids.  This problem is easy to fix!  Leather couch, not as fortunate.

The other costumes I've seen were of much lower quality and left a lot to be desired.  This one is worth springing the extra dollars on, especially if you think your little one will use it more than just Halloween night.  Honestly I think my daughter could be Scooby next Halloween if she wanted.  Very satisfied overall with this purchase!