Would you let your kid play outside looking like this?

My son had his 10th birthday party this weekend. Among his gifts was a Lego Ninjago magazine that had instructions for how to turn a simple t-shirt into a ninja mask. This was the result.

Now before ISIS came along, you might only think ninja. Now I think ninja would be a distant second thought. His friend Nick was over the other day and they both made these and wanted to play out on the lawn. Yes of course I let them, but I could only imagine what the neighbors were thinking.