Prepare the mask:
On 8 1/4 inch piece, place right sides together, sew 1/4 inch seam, creating tube.
Turn right sides out, press seam and fabric.
Make 3 pleats, approx. 1 inch each in size, using steam or pins to hold. Mask will be approx. 3 to 3.5 inches in width.
Sew 1/4 inch seam on each side of mask, securing pleats.
Trim seam allowance.
Prepare the ties:
Fold in half and press (3/4 inch). Open tie back up.
Fold each edge in to meet middle (3/8 inch/0.375 inch) and press.
Fold in half again, securing raw edges inside and press. Each tie will be approx. 3/8 inch in width.
Assembly:
Align center of tie with side of mask, open tie so edge of mask fits snugly inside. Pin.
Sew tie to mask, seam will be very short. Get as close as able while still catching all fabric. You are just attaching the mask to the tie at this point, not sewing the whole tie yet.
Repeat for other tie and other side of mask.
Sew down edges of tie, securing raw edges inside. Seam is very short. You will stitch over where mask is already attached. This is good because it helps reinforce.
Repeat for other tie and other side of mask.