You will get used to it. I've even shot from the layout boat with mine on.

If the weather is nice I may unzip it for some air and additional freedom of movement, but I always have it on. Most also have a buckle waist strap on the inside, so unzipping does not make it entirely unsecure.

I prefer the jacket style to the full length coat for shooting, as you may end up sitting on the "coattails" which isn't ideal when shooting from a sitting position. Plus if you do wade the jacket will stay drier than the coat.

Mustang makes a float jacket in olive drab. Onyx makes a float jacket in camo.