Well, I finally decided to get off my ass and start on my ghillie. I did some reading and thinking this morning, and decided I'd like a jacket-only type. I have BDUs and flight suits I can use, but flight suits aren't very durable or warm, and BDUs aren't very warm. Plus, I hate wearing pants over pants. So I set off in search of a jacket that I could use. I hit a surplus store and found the perfect item: a long-ish green overcoat, made of some sort of reinforced fabric, with a removable fleece liner. It almost goes down to my knees, so it'll give me good coverage. I plan on only covering the back and the arms, so I can crawl. I also got a desert-patterned helmet cover for my head. I can use the velcro loops on the helmet cover to attach it to the back of the jacket and use it as a hood. The jacket was $29.95, and the helmet cover was $4.95
My next stop was jo-ann fabrics for (hopefully) some netting, burlap, and fabric dye. No luck on the netting, but they did have burlap and RIT dye. You can also buy burlap at any home improvement store, but there are some advantages to getting it from a fabric store. For one, they usually have it dyed in different colors. Landscaping burlap is usually just a natural tan color. This is a winter ghillie, and I needed some WHITE burlap. Secondly, you can buy as much or as little as you need from a fabric store. I picked up almost two yards of white burlap, and a yard and a half of brown burlap. I also got a box of dark green RIT dye, and a box of grey RIT dye. The burlap was $2.99 a yard, and the dye was $1.99 a box.
Next: Gander Mountain (an outdoors store, if you've never heard of it before). I've heard of a lot of different ideas for the netting on a ghillie, from volleyball/badminton nets to fishnets, or even handmade netting. I was having a hard time finding something I liked, and I was about to buy some para cord and just make my own, when I stumbled on replacement netting for dip nets. I picked up a 30" hoop by 48" deep replacement net for $9.99, a perfect amount of netting to do the jacket.
Then it was on to lowes, where I went looking for shoe goo. You can either sew the netting on, or just glue it with shoe goo. Glue is obvoiusly a lot easier, and from what I've heard, works just as well. They didn't have shoe goo specifically, but they did have "amazing goop" which is basically the same thing. It's a flexible silicone-based adhesive and sealer. Really, anything that says it'll work on fabric will do. I picked up two tubes of amazing goop for $2.98 a piece.
Then I went BACK into lowes, realising I had forgotten to get a bucket. Any of you who've dyed things before know that dye will color practically ANYTHING it touches. The only bucket I had at home to use was my car-washing bucket, and there's no way I'm gonna dye my red cars green. So a new five gallon bucket cost me $4.98. I also picked up a new sharp set of scissors to cut the burlap with, for $4.98. Obviously, if you already have a bucket or scissors, you don't need to buy more :p
Everything together (with an extra, 10x25 binoculars I picked up from gander for $11.99, to use for spotting):

I'll be updating this thread as I move along in the process of constructing the ghillie. I'll also be keeping a running total of the cost of the project, and the time it took me for those who are interested in trying the same thing.
Cost tally:
Jacket: $29.95
Helmet Cover: $4.95
1.75 yards of white burlap: $5.23
1.5 yars of brown burlap: $4.49
2 boxes of RIT dye: $3.98
Netting: $9.99
2 tubes of amazing goop @ $2.98 a tube: $5.96
Bucket: $4.98
Scissors: $4.98
TOTAL: $74.51
Time: ~2 hours