Desperately seeking summer tops with built in bras. Help a girl out!

Additional specifics (and the reason I’m struggling): 53 years old, D cup, living in hot humid climate. Prefer natural fabrics, cotton, rayon, cotton blend, would not rule out wool (haven’t tried those yet), rayon or similar. I absolutely can’t stand the feel of polyester or nylon! Currently looking for close fitting tops I can wear with flowy, wide leg pants. Ideally square, round or boat neck, trying to avoid skinny straps or crop tops. At 53, I need more coverage. With the right top, I could wear a bra, but trying to avoid extra layers. Bra tops are so easy.