1 Download the template, then print out and follow the cutting guide. On the back pieces, with right sides together, match the notches, then pin and sew the centre back seam. Tidy and press to one side. Pin each dart in place and stitch from the waist edge to the point. Press towards the side seam. For the front pieces, put right sides together and match the notches, then pin and sew the centre-front seam. Neaten, then press to one side.

2 Apply interfacing to the wrong side of the front flap facings. Position the facings right sides together on the front trouser, aligning the V-shaped stitching lines with the narrower side to the centre front. Mark the V-shaped stitching lines with a fabric pen and ruler for accuracy. Sew the facing flap to the front trouser along these lines, from the waist edge to the point; leave the needle in the fabric at the point, pivot and stitch up the other side.

3 Cut down the lines to as near to the point as you can to create the front opening section. Trim excess fabric from the wide end of the V, then turn the facing flap to the wrong side of the front, ensuring the fabric at the point lies flat. On the buttonhole sides of the front facing flap, neaten the raw edge and understitch to fold neatly to the wrong side along the seam edge, then press.

4 The other parts of the facing flap are for the buttons and will go underneath the buttonholes on each sid