Hello all! I would love your help dating this piece. At first glance, I thought "well, this is clearly 40s," but now, I'm not so sure. There is no metal zip, closes with hook/eyes and buttons only. I've included many photos and a shot of the seams. I'm working so hard at improving my dating skills, but I know the real secret is time and experience. I'd love also please any dating resources/books you've found helpful. I so appreciate your time and input. Thank you.