A word about 'warm clothing'.
I've seen this before - in fear of freezing a guy buys the heaviest sweaters he can find, the heaviest jackets he can find, the heaviest pants etc etc.
Then he cooks his ass off when it turns out to be a mild day and he's hiking
Or he's bundled like the michilin man above the waist, and is still freezing because he just has one layer on below
Learn to layer. This is critical. You will stay warm and dry if you master this art, you will freeze and/or cook if you do not.
You have your 'wicking layer' against your skin - the layer that is designed to move sweat away from your body and to keep your skin nice and comfortable. Then you have your thermal layer - the heat retainers and such. Then you have your 'weather layer' so to speak - the outer layer which will protect you against wind and rain.
For the inner layer - look for synthetic long underwear. Use seperate tops and bottoms, not one peice jump suits. (trust me.)
For your thermal layer - you can buy cheap fleece sweaters and vests just about anywhere. These can be extremely effective. Avoid anything cotton or down, just stick with the synthetics. Remember - you're better to have a couple thicknesses to choose from so you can adjust to the temperatures you find up there. Some people use 'jogging pants' made of synthetics as a thermal layer under their pants and over their longjohns for really cold days, although often just good longjohns under your pants is enough.
For your outer layer, wool pants are probably the best 'cheap' alternative out there. Avoid anything with cotton. 100 percent wool can be a little itchy on days where it's too warm for your longjohns, but most wool these days have just a little bit of synthetic in them or have liners, which make them quite comfortable. Wool will stay warm even when wet.
For your jacket outer layer, here's where you run into a little problem. You need something QUIET. You do NOT need something camo btw - but quiet is a must. The problem is that 'quiet' and 'waterproof' rarely go together. The best you're likley to do is water 'resistant', unless you spend some money.
Wool jackets are quiet (but heavy), saddlecloth is pretty good - For many years we hunted in nothing more than fleece outer jackets sprayed with a little scotchguard to help make 'em more moisture resistant. I'm told these days you can buy stuff to treat fleece to make it very water resistant.
To determine how quiet something is - scratch at it with your nails. If you hear a loud 'scratch' like you do when scratching nylon, forget it. The animals will hear you a long way off. If it's quiet, like an animals hide might be, then you're fine.
Your jacket does NOT need to be super thick or insulated, but it should be large enough that you can fit a couple of heavy fleece shirts or vest on under it.
A cheap 30 dollar rubber foldaway poncho can give you an extra layer for if it's REALLY raining out. That way your main clothes don't have to be super water proof, if it starts to pour then you go to the poncho, and for light rain or drizzle your clothes are fine.
NOTE - You do NOT need camo. Camo is HIGHLY overrated. Nice when you can afford it, but otherwise don't even think about it. Manufacturers feel it they put the word 'hunting' or 'camo' in clothing then can jack the prices.
Anything in green or red is good. Avoid blues - they can see blue. Red just looks like more green to them.
DO NOT UNDER ANY CIRCUMSTANCES WASH YOUR HUNTING CLOTHES WITH STANDARD LAUNDRY DETERGENT.
All laundry detergents today have 'brighteners' - which will make you stand out to game animals at dawn and dusk. Use baking soda, or one of the many 'hunters' laundry detergents available with no brighteners.
If you look around, you can probably put your whole clothing package together (except boots) for about 200 bucks with spares. You probably have some of this stuff already. Some things like longjohns you can order over the web - they're 'streachy' so you don't need a precise size. That'll help you find a 'good deal'. Check out places like marks work warehouse as well for 'work pants' and stuff, sometimes they have deals. Costco is a great place for cheap fleece. Look for turlenecks, heavy sweaters, and vests - that and a thermal underlayer and decent jacket will let you adjust to any weather, from warm to below freezing. Get thick pants and good bottoms for your longjohns - if it's warm skip the longjohns and put less on your top.
Hope some of this helps.