How to deal with hot maps?

Hello!

I recently started a colony of tree loving transhumanists. I figured going arid shrubland would be a good idea because I wouldn't need to chop down a lot of trees.

I'm struggling with managing heatstroke for colonists outside mining, fishing etc. indoors is easy to manage, as I've got everything AC'd.

Im running most vanilla expanded mods, and have ideology and royalty. I was wondering if there's a clothing article that helps to cool them down, or even better an armour that will help?

I typically play temperate forest so this is a first for me.