I wet wade in the summer in Polypropelene long johns under a pair of quick drying shorts. The polyprops protect the legs from the sun and the brambles and dry out pretty quick. As for footwear I used to wear felt soled boots with gators but they are now banned so I have changed to an old pair of army surplus canvas jungle boots, they are great and only cost about $25.
The very best summer time indicator in my view is a Dry fly. Whatever pattern suits the water you fish but I usualy choose something with a nice visible poly wing.
All the best.
Mike.