There are a lot of ways to map the same object. That's just one way.
You could make several 'fabric panels', or front/back (cut the entire object in half, then unfold) w/ seams down either side. For that you would keep the crotch cut and run cuts along the outside edges on either side; but forget the back side cut. Other ways could work also. Much of it depends on your texture source.
The important thing is that there is as little distortion as possible in the map(s).
Less number of seams is usually easier to texture; but isn't always what you want.

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