I think I was more excited than my son about this, he's 7 and wanted a ninja suit. Decided to get him something authentic rather than the nasty fancy dress ones. Now, it wasn't cheap at around £28, but the quality is amazing; heavy cotton, all the other additional bits like the hand guards come with it and of course the mask.
The only think I'm not so keen on is the belt which is silky rather than cotton - but that's neither here nor there to be honest. Basically, my son donned the suit on Christmas and just kept it on, I'm going to upload some photos because it really does look great.