I see that linen is not very popular. Well, horses for courses as Angie says. I’m curious what would be the most used fiber. Cotton? Of course!
I love silk for summer, too but there is not a lot washable available. I’m always so tempted by silks and have a number of tops in my wardrobe. But it feels too dressy often. Also wrinkles. It’s on my no buy list aside for a special occasion items.

Cotton is very useful, all my t-shirts, more than half of the dresses and button down shirt, some pants are cotton.
My summer wardrobe probably is 20% silk, 45% cotton and 35% linen.
I have some blends with viscose but a few (by choice). No modal or polyester, acrylic in any form but for gear and swimming.

What about your preferred choice of summer fabrics to wear?