This is the easiest tutorial ever to make such an awesome looking ninja mask!
Step 1: Get a T-Shirt (preferably Black)
Step 2: Turn It Inside Out
Step 3: Put on Shirt
Make sure you don't put your head through the hole as seen in the picture.
Step 4: Tie Sleeves on Back of Head
Don't actually tie just wrap one around the other and pull...Kind of like the first step in tying your shoes.