Some breathable hip waders might be you best bet. Some nice Dan Bailey's here on sale: http://www.mrfc.com/MadisonRiverShop...x?CategoryID=4
For strike indicators, when I do use one I use one of these floats from Lindy's and peg it with a tooth pick like bass fisherman peg a bullet head sinker.
Becareful with whatever insect repellant that you use since they will raise Cain with your fly line coating and your rod paint job as well.