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Sew with large stitches along the edge of the pant legs and gather.
Prepare knee straps. Fold pieces lengthwise, right sides together, sew along short edges, and turn in the seam allowance of inner part while sewing. Turn inside out, press. Sew knee strap to the pant legs, at the inside sew on straps by hand.

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Close darts, close crotch seam, either as a flat felled seam or as French seam.
Prepare waistband: Fold in seam allowances and press, fold straps lengthwise, right sides together, and sew along short edges. Turn inside out. Pin the waistband to the trousers, fold all darts towards the center back, sew through all layers.

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Mark the position of buttonholes and sew, sew on buttons.