I own a lot of nice, soft cotton, but my favorites are the silky ones made of stretchy microfiber, especially under dresses, which can stick to cotton.
Yes, for everyday wear cotton is the way to go. It's also good for vulvas because it breathes. Sometimes I'll wear other materials for a day, depending on what clothes I'm wearing, etc. And in lingerie that's only staying on for a short time before sex... anything goes!
I really love the seamless type. Not sure what they're made of exactly, but I know it's not cotton. It's very light and feels cool to the touch. Nice and thin and best of all, no seams!