@ai6yr Wool is the most common fabric for men’s suits for year-round use. Lightweight worsted wool can be reasonably cool in summer (as suits go). And back in the day, wool was often used for sports clothing (eg, cycling jerseys).
@mattblaze @ai6yr Wool is a very useful fabric.
https://shepherdsdream.com/blog/wonders-of-wool/how-wool-keeps-us-cool/