Oh wow! I love #1 and don't think it's dated in the least. Sheaths are huge right now. Totally on trend, don't you think? And, it's a gorgeous color on you. Throw on some pearls for summer and you're all set for a garden party, or add a black to it for more sophisticated look (blazer, belted BF cardi, black pumps or boots).
#2 is my favorite and I think it offers loads of creative options. It seems "on trend" to me too. You might want to shorten it but I don't know if I'd go as short as tunic-length. Just a bit above the knee, to make it a little more flirty? Since it's a higher neckline I think you can bare more leg. Would have to play around with that. It's got such a great vibe, I think you need to experiment! I'd love to see a BF blazer over this. Leggings. Shorten the hem and add slouchy boots? Cascading cardi?
#3 is my least favorite, and if it's got stains, I say give it up. Only thing I might do with it, is possibly make it into a skirt? But is white practical for your MOTG lifestyle?