In hot and humid weather I use A* mesh pants. They have mesh on the front and backs of the legs only, and solid textile elsewhere. They breath ok but don't really cool me down as much as I'd like. I wear shorts underneath. A mesh jacket will have much more cooling effect. There is a point where if you are not moving you get hot quickly. For me it is about 31C. Try to get a lighter colour for your mesh or textile, as black is hot.