Cut out the pattern and your fabric.

Place the pattern over your material and use a rotary cutter and cutting mat to cut out the left leg.

Flip the pattern over and cut out what will be the right leg.

Sew the inner leg seam

Fold the left leg section in half, so that the top side of the material is touching. Starting at the crotch, sew down the inner leg seam.

Repeat on the right leg piece.

Sew the crotch seam

Fold each leg right-side out. Match up the front of the left leg to the front of the right leg with the top side of the material touching itself and sew from the front, through the crotch, and up to the rear.