It's well known that a one-holed torus (doughnut) results from identifying a rectangle's opposite sides: by sewing the horizontal edges we get a tube and by sewing the vertical edges (which mutated to circles) we get a torus.
But how can we make a two-holed torus? Theoretically one gets a two-holed torus by identifying an octagon's edges in the following way:
But in nature? ... Let's try it. One needs the following things.
Construct (or draw) and then cut the octagon:
And now: sewing, ... (after the second seam emerges a topological pair of trousers) ...
don't forget the stuffing!!
The last seam ... Ready! The two-holed cloth torus:
By the way, you can use this needlework as a strange two-hands mitten.
And now ... "We sew a three-holed cloth torus".