A quality base layer is an absolute.Something that has some wicking material like polar fleece.IMO,this should be where your money should be spent.
Then you can bargain shop at Rural Kings or Wal marts or whatever.Hit the sale racks.Stay out of the hunting department,you are paying for camo patterns that will just be covered up by other layers.:embara:I start with a turtle neck t shirt.Then I bought some blue jean thinsulate pants(the red lined jeans)for 35 bucks I think and I found a fleece style shirt for 9 bucks that was green.I also found a mid weight fleece jacket on sale for 20 bucks that I cut the sleeves out of for the extreme cold days.
I have bibs and parka set that was expensive but after layering the way I do,I rarley need the parka so I imagine any kind of bib/parka combo will work.An outer layer of HEAVY fleece should do you and it can be found cheaper than bibs and parka in many cases.
The key is to keep your feet warm,I don't even wear insulated boots anymore.I use the Arctic shield boot blankets(kinda expensive but well worth the price)I get to stand and then put on the base layer socks and then wool if its cold,not before I get to stand.Then I put on the shields and if it is extreme cold temps,I put in hand warmers(only had to do this once)
I use a ninja style head cover with a camo face net to hide the black and I payed about 9 bucks for it I think.
I have sat in 8 degree weather for 3 hours completely comfortable.