best over-whites are
TROJAN OVER WHITES by DHK International but they are EXPENSIVE. they are made of waterproof mil-spec ripstop nylon. My cousin got a steal on a pair on ebay about 2 years ago but they are impossible to find cheap. what i did, was take a pair of my regular old $30 polyester cabelas overwhites, bought 5yds of mil-spec ripstop nylon on ebay for like $3/yard and basicly made a guillie suit out of it all with the ripstop nylon all the way around the legs below the knee, over the thighs and crotch, 2 thick on the butt, and over the chest and elbows. I took an old white net that was used to stop golf balls and put that over the head and down to the bottom of the jacket on the back and have a small amount of white material on it as well as some white cotton yarn. the yarn sticks well to grass and weeds so that when it is not completely white out, you can snag a bunch of grass in it so your not TOO white.
I will get some pics up soon, I think ya'll will like.
as for somewhere to buy waterproof white camo, i dont know why more places havent figured it out yet...but they are few and far between if you dont want to make your own.