just go get some white cloth at your local JoAnne, and sew some pajama style overall's on your regular clothes.
you can also go to a surplus and get the military snow covers for about 35 bucks a set. they are nice and have good snaps on them. I'd recommend hitting them with some black marker or paint to bust up the outline a little.
I got ya. I use a polypropoline painters coverall ( A Tyvek coverall also works). They are one size fits all. I wear it over my orange hunting digs. You can use a can of cheap paint to stain and make your own branches and what ever you want to create as to what will work for where and what you hunt. You wash after you paint it and it's dry and use scent killer on it. These suits sell for $7-10 at Lowes and almost any hardware store. And if you get a nasty rip, it's not an arm $ leg loss or fix.