A quick safety note. One of the people who ordered a mask from me requested two different fabrics for front and back. That’s fine — see pictured in third mask. I’m guessing she asked for that to make it reversible, to coordinate with different clothes.
The problem with that is that it’s safer if you always know which side of a mask is facing outwards, and which is facing inwards. That’s why the typical mask I make (first two) has the ‘wrong side’ fabric on the inside, so you can easily tell which bit is in contact with your own mouth, and which bit is in contact with the outside world.
If you’re wearing a mask you plan to reverse, please be aware that you need to be very careful to wash it thoroughly with soapy water between uses. You should be doing that anyway, of course, but I wanted to highlight the added potential risk.