My son wore this for Halloween.  He is about 5'6 - 5'7 and thin/athletic build.  This fit him very well.  We had also ordered the adult small, but it was like a tent on him.  The teen size was much more appropriate.

Now the belt and chest strap thing that this comes with is crap.  We ended up purchasing a separate sword belt.  The arm and boot covers were "ok".  The elastic straps on the boot covers didn't survive Halloween night.

The tunic and hat were decent.  Sword and wig are not included.  We skipped the wig entirely and acquired the sword separately.