Avoid excessive alcoholic beverages which can be dehydrating, and avoid a diet overly rich in red meats and fried foods, both of which are heating. It also makes sense to wear lighter clothes and colors like white, yellow, and cotton clothing. It's not the time for long black turtlenecks. If you want to wear something long, that's fine if it's light and cooling. Dark colors even make you feel mentally hot.
Color is a form of energy.
It's good to learn to identify this plant. I feel that poison oak or ivy are nature's way of saying, look where you are going. Not all three leaved plants are bad. Poison oak and ivy are difficult to identify because they can be a shrub, vine, or single plant. They turn beautiful red colors in the fall.