Place your three pieces of material in front of you.

The piece that will be in between (the filtering layer) goes down first.

Then place the next piece right side up.

Continue with pinning elastic on each of the short 6" sides.

Start the elastic 1/4" in and pin/clip it there.

Then repeat the elastic allowing the elastic to form a smile on the INSIDE of the material.

Next, pin the bottom piece of elastic on the same side, again about 1/4" from the bottom.

Repeat the entire process of elastic pinning on the opposite 6" side.

Now it's time to sew.

Start with the elastic short side and stitch down from one piece to the other.

However, do not catch the 'smile' portion of the elastic in the stitching.

Only stitch each end of the elastic strip.

Now pivot the material by lifting the sewing foot and proceed to stitch close to the edge as possible until you come to the next short 6" side.

Once you are at the next side, put sewing pedal up, and pivot.

Now repeat the stitching pattern for the elastic on each end.

At the end of this side, pivot the foot once again.

However, this time only stitch to about 6" leaving 3" open in order to invert the mask right side out.

Clip thread off of mask and remove the mask from the machine.

Now, Invert the mask from inside out.

Make sure to get to EACH corner and push that material out to make a very rectangular mask.

cing the middle piece down first. (white in image above)

Right side up, upside down, it does not matter NO one will EVER see that piece. 

Next, if you have chosen material with prints place the print right side up atop the first piece. 

Now, lay the elastic onto one of the short sides (6") side about 1/4" down. 

You will pin that (until you get good enough to go freehand. 

Flatten the mask in front of you and match the Gap together.

Most likely you will need to turn the material into making a seam.

Next, put the mask with GAP side under the pedal.

Start at ONE end of the long end with GAP and stitch all the way from end to end closing the Gap.

Again, remove from machine, cutting the thread.

Now it is time to Pin in 2 tucks.

Place the mask in front of you.

Tuck the material on one side.

You want to gather about 1/4" on the tuck and PIN/CLIP it down firm.

Repeat this one more time in the same direction or the tuck and clip or PIN it down.

Follow the TUCK straight across and repeat the tuck and clip for the opposing side of the mask.

Before you return the mask to the machine, make sure that your clips/pins and tucks are secure and that the tucks are straight across evenly.

If that is all right, then move the mask back to the machine.

begin on one of the short corners. Stitch forward and track backward one time to ensure the material is tucked and will stay taut.

Then pivot the pedal, follow along the long side until you get to the next tucked short side.

PIVOT the pedal and stitch exactly as you did on the opposite side.

Once complete do not run the pedal down this side as you already have when you closed the Gap.

Snip the threads, remove them from the machine.

Try on and enjoy it!