I have been using a set of insulated coveralls for the last two seasons and like them very much. I purchased an inexpensive version from Dick's for about $90 and they have worked well (wind- and water-proof, quiet), but I will likely get better one's from Cabela's (perhaps Revolution Fleece: I have an uninsulated pull-over that I like very much) eventually.

My coveralls also include a hood: while it is very warm, it also greatly restricts my vision and hearing, so I rarely use it. I just purchased a ball cap from Cabelas that has gore-tex, thinsulate insulation, and fold down ear flaps in case my ears get cold (although this will also restrict my hearing) that I am looking forward to using. I like to have a hat with a bill so that I can clip on a small LED flashlight when finding my way to or from my stand in the dark and to provide some relief from occasional bright, sunny days.

I also like to have a ski cap that is reversable (camo on one side, blaze on the other) that I can pull down over my ball cap. Many times throughout the season a blaze hat is required and other times it is just a good idea: the reversible ski cap can provide the blaze orange hat when necessary or simply be pulled down over the cap for extra insulation and ear coverage that does not interfere with my hearing.

By varying the clothes that I wear under the coveralls ( t shirt and shorts or very light pants to shirt/fleece turtle-neck/fleece sweatshirt and insulated pants) as well as substituting a standard ball cap for the insulated version in warmer weather I can use the coveralls comfortably from 50 degrees down to 20 degrees (10 degrees if there is not too much wind). This accounts for about 3/4 of the season here in western PA.