Flute masks are kind of tricky. However, there are many different solutions to be found online now. There are masks you can order from different companies, there are a number of designs and patterns for making your own (check out Etsy and other websites), and you can find video tutorials for making masks and altering traditional masks.
Here are a few different designs for making flute masks to enable flute players to still play and keep their air stream from blowing too far forward:
Flute Mask Instructions