Why do pants have side seams and a back seam? Isn't it possible to just use one piece for a leg or for the back side (e.g., corresponding to the outline of

Pants Fitting Basics

Which stitch should I use to hem trousers by hand? - Quora

Pinning Pants to the Waistband – HandmadePhD

Top Down Center Out with the Eve Trousers – The Crooked Hem

Crease Line Placement at the Knee – HandmadePhD

Why do we wear our clothes with the seams on the inside? - Quora

What are ponte pants? - Quora

Help! Problem with the back panel of trousers sewing discussion

Why does the side seam of the pants rotate forward? - Quora