I found this mask while searching for patterns to go with my Ninja Turtles hats. 
It’s perfect for my purposes but also comes from a blog with stunning patterns!
It’s in US terms so whenever it asks for an sc, crochet a UK DC. Whenever it asks for an hdc, crochet a UK HTR. Whenever it asks for a dc, crochet a UK TR.
The pattern asks for elastic to attach so the mask stays securely on your head, but I’m going to use two long chains at the back on either side as ties. These are easier because I’m still scared to attach crochet to fabric without ripping the fabric, but also because this goes along with the Ninja Turtles masks.
UK Crochet Patterns 
the links aren’t working 😦
Oops! Two of them were duff but are now fixed! Sorry about that and thanks for letting us know :>
Yes! Perfect for my incoming nephews!
Thanks for sharing!