Thank you, all!
Joy, the tees are rayon...so yes, breathable. And machine washable in cold. Or so they say. I don't anticipate they will wear super well....but I got a massive discount on them so if they last for one season looking fresh, I will feel fine about the purchase.
Peri, that neckline would be very covered for most. But it is a question of proportions. With my long neck, square jaw, big head, and small bust/ bony chest, exposing much in that area is a figure flattery mistake. On the plus side, a long neck means I can wear my beloved turtlenecks, high shirt collars, and other high necks with impunity, where others need to think twice about those.
Sveta, the lining is some kind of stupid poly. (I will have to look.) Admittedly, it feels great right now, but in the heat? I doubt it. They would be very see-through without lining, however, and might not drape as nicely. Angie said she much prefers the white to the taupe in these pants. Well, guess what? The taupe are not lined. I'll be it subtly affects the drape.
Jan,Sarah, Caro, Makrame thank you for weighing in. It is a real conundrum for me at the moment about the lining. .