Most sandals or shoes that are meant to be worn without socks have insoles that don’t absorb moisture - not to mention, these materials aren’t very comfortable. I can’t wear most of the sandals or thongs I see due to hyperhidrosis. I’ve seen very few open-toed shoes that have cloth or fabric insoles. Can anyone recommend a line of shoes (or specific pairs) that have absorbent/fabric/cloth/suede insoles?

On my job as a school teacher I wear polo shirts and button up shirts with no tie. I get out in the shop daily so I’m in a hot, dirty environment but I must remain presentable. As luck would have it I sweat profusely. What clothes cover this up the best? Is there a certain color or fabric that works best?
Thanks, your answers are appreciated.