I second Wesing's advice on the the Flynn method.
I piece backs a lot, sometimes by choice! My main goal is not be on a typical fold line, in your case I would add one skinny band to your wide band -- if you don't do the diagonal. Back in the day the usual technique was if you needed two widths, you cut one piece in half the long way with a skinny-wide-skinny. That was mostly about the fold line. I typically use a 1/2 seam and press open and flat.
Maybe some long armers will respond to this thread. I believe the preferred seams for them are horizontal and not vertical, but I'm not sure on that. I've done it both ways with my projects.