Army surplus.
Cabelas.ca has a suit on sale... I bought this same suit a couple years ago and it works well.
https://www.cabelas.ca/product/139663/truetimber-mens-lightweight-snow-camo-coverup-pants
^^this^^.....I have a set of whites from them, made of parachute cloth. Very durable and light weight, pull over your everyday clothes and go. If I remember the top and bottom were about 30 or 40 bucks as a set.
Tyvek painters suit is gotta be the best winter camo there is. Wind can't penetrate it , nearly waterproof and so light it can be stuffed into a pocket on the day pack with ease.
I took a large pair so it fits over my usual winter atire easilly. The elastic cuffs at wrists and legs are awesome.
So you take said tyvek painters suit and put it on a coat hanger and hang it in the garage or anywhere else you can spray paint.
You can use brush on paints as well if you like.
With light/dark browns, greens and black spray paints add some detail to the suit..... not too much but enough to break up your outline. Match the colors of winter in your hunting area.
Let it dry and it's ready to use.
So simple, so cheap and very effective in cold weather winter hunting.
friend of mine used to use his white coveralls. with lines drawn on them with barbeque briquettes. break up the outline. seem to work just fine.
I've been looking into getting some winter camo for predator hunting (coyotes) but it seems hard to sift through the junk on the market. Lots of it is noisy, poor quality, etc... so it's hard to know what to get.
I may end up trying these suggestions. I'm on the fence about going with white and making grey marks or going with a grey and making white marks. I feel like especially when you're against a tree, the white can stand out, but I don't really know. I guess the important thing is to break up your outline with the general patterns and colours of the area you're hunting.
The tyvek suit method is about the cheapest garbage you can get. I'd rather wrap a bedsheet around me than wear tyvek.
The way tyvek works is you put it on poking a hole through the leg with your boot and tear the crotch out when you pull em up. Walking to stand you swish swish every step like your crumpling plastic bags. By the time you have made it back to the truck you have left 6 or 7 strips of suit on branches along the way, the crotch rip now extends all the way through the seat of your pants and the zipper has broken making the suit act like a sail as you walk into the wind.
Fabric coveralls or surplus overwhites are way better. Iv even just bleached an old Carhartt jacket.
odd.... my experience is quite the opposite.
Tyvek is pretty tough stuff. I've never managed to tear my DIY winter camo and I don't find it very swishy when walking.....
A smart guy might put the boots on after donning the suit.... but that's just me thinking out loud.
I also have an Arctic shield parka and bibs which are nice but walking anywhere in that suit you get too hot and sweaty in a hurry.
There are trade offs I suppose but the tyvek (actual tyvek) suits are great because they weigh nearly nothing, can be packed very small and stuffed into the day pack like one would do with lightwieght packable rain gear. Get a size or so bigger so the suit comfortable fits over whatever you are wearing. The other benefit of Tyvek is that wind can't penetrate it.... and because of the running composite fibers in the fabric, tyvek has very high tear strenght. These properties are well known by those in the building trades.
Cabelas.ca has a suit on sale... I bought this same suit a couple years ago and it works well.
https://www.cabelas.ca/product/139663/truetimber-mens-lightweight-snow-camo-coverup-pants
https://www.cabelas.ca/product/139662/truetimber-mens-lightweight-snow-camo-coverup-parka