I use several combinations according to weather, but I'll try to be brief.
Start at footwear.
Wore any 'ol huntin sock for years until I got tired of cold feet and bought some more expensive Woolrich brand Expedition series socks at Wal-mart. You can't always find them, but you MUST use 100% wool socks to wick away moisture and for warmth. Didn't know what I had been missing. I have some that are thinner for warmer weather. I only wear 1 pair of socks ever. I like the tall ones over the calf.
Something like these over the calf. You can find the same thing much cheaper at Wal-Mart....around 6 or 8 dollars a pair. And worth it. I would buy 1 pair every year for several years, and didn't feel the impact on the budget as bad.
I have two boots, a Lacrosse 1200 gram thinsulate large pack boot (not made anymore) and a rubber boot, Alpha Burly by Lacrosse. http://www.basspro.com/webapp/wcs/stores/servlet/Product_10151_-1_10001_65591____SearchResults
Had 1 pair of Rockys and since then have always had Lacrosse and I swear by them!
Now remember you can use different combinations depending on the weather condition. e.g. thin socks heavy boots or heavy socks and rubber unlined boots. For very cold I will wear the heavy boots and heavy socks. If its extreme then I bring out the secret weapon. BOOT BLANKETS!
Bought my blankets years ago and love them. Have sat for hours in 0 degree weather with the wind blowing. You carry them with you, they are not to be warn while walking. When you stop to hunt they cover everything on your feet including whatever boots you are wearing. If your feet still get cold you can lay handwarmers inside right on top of your feet and they will not be smothered and start to get cold. These can make the difference between hunting and sitting in the house for me.
Gave $50 for mine 15 years ago and the price is still the same. Well worth the money! All covers are not the same......I recommend these!
Will, I have tried different techniques, but if its real cold out I've found its best to put them on over my boots before
my feet get cold. If I wait till my feet get cold I can't seem to get warmed back up as easy. If needed throw in 1 handwarmer on top of each boot and pull the drawstring in tight, but I have to be careful, my feet sometimes will start to sweat...
For a Gore Tex suit I have a Suit made by 10x. Shikari cloth with a little Thinsulate lining. Can't find much info on it, may not be made anymore. But I only wear Gore Tex down to about 30 deg. After that if I hit a bunch of snow I just put plenty of warm clothes on. I mainly use Gore Tex in rain or high winds down to 30 degrees.
Bibs or Coveralls:
As far as bibs and coveralls, I think any good quality outfit will work. The ones I wear aren't made anymore.These sure are nice....$$$
I do always like to wear a Jacket or parka with bibs. I don't care for 'coveralls'. Main thing is the proper layers. Many thin ones if possible. This all varies on weather condition.
I have some insulated polypropelene I wear for base layer but I would go with the merino wool when I can afford to buy again.
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0058118980879a&type=product&cmCat=SEAR CH_all&returnPage=search-results1.jsp&Ntt=insulated+polypropelene+thermals& Ntk=Products&sort=all&_D%3AhasJS=+&N=0&_D%3Asort=+ &Nty=1&hasJS=true&_DARGS=%2Fcabelas%2Fen%2Fcommon% 2Fsearch%2Fsearch-box.jsp.form1&_dyncharset=ISO-8859-1
Didn't get to hats and gloves but oh well, this was enough...
So much for being brief...........
This made me realize I need some new stuff, lol, I'm kinda outta date....