Preventing sweat-through-clothing while biking?

Cycling shorts and jerseys will help a lot. Trying to trap or absorb sweat will just cause you to sweat that much more. They make baggy shorts for mountain bikers. I can ride in 90 deg weather and not break a sweat until I stop but I am riding pretty hard. You want a material that doesn't absorb sweat like cotton. Keeping your body cool with help with your face getting red.