Around here it usually does not get very hot and the rivers are always cold so I wear my Jacket most of the time when Wading. The biggest thing that I find is breathable waders help A LOT! If they are just rubber waders you tend to go feet up with a decent fart
LOL! Its something to look into and invest in as I have had cheaper waders and I feel sometimes I am like a balloon especially if I do the belt up tight. I wanted to share this video, and yes I know you cant wear this at all times but it is a very light jacket and I dont get very hot unless we are above 25 degrees C which is rare around here. And on those days I just fish smaller rivers and dont wade as deep. I keep a rule of thumb basically if its above the belt I do not go in any further as this is where my jacket cuts off.