In looking at the other fabric designs sometimes it looks like they put two seams on either side of the neckline with two other strips of fabric crossing the grain for that "4 way stretch" thing. It's a bit easier to see in this picture:
That one makes it look like its made from four pieces of fabric, two long for the sides and two shorter ones for the front and the back with a neckline sewed in the middle...
Thanks for the diagram, lol, makes me feel super dumb that I couldn't figure that out. I blame "pregnancy brain".
Any suggestions on the proper fabrics for this? Looks light SUPER light weight knit, but rayon/cotton blend or... what do you think?