Im made mine out of scrap chloroplast and plastic fence post. Light weight extremely durable and double as target hangers for shooting. Ive got like 3 dollars I each of my 5 and have used them 8 years.
I have always done similar to Ken. I use a disposable painter's coverall. I hang it on a wire hanger, then hang it on the top of plastic fencepost stake. I've never used the purchased ones, so I don't know what benefit they offer. I've just found these were awfully easy to slap together and use immediately without expense or waiting for shipping.
I was warned a long time ago by someone that their dog was spooked by the coverall arms flapping in the wind and therefore they avoided those kinds of stickmen. My personal view on that is that I'd probably get my dog used to these sorts of objects as something not to be afraid of. Of course, if I had a dog that really hated them, maybe I'd feel otherwise.
Don't forget to make some stick women, too. I got one as a judging gift. One of my white Tyvec painter suits on a coat hanger thru a 6 ft garden stake - with a black bra donated by my co-judge...
I had to stop using it, tho. I had it out in the breeze near the fence on a turn of the gravel road around my back field. Two young ladies came around the turn a little fast, saw the stick woman and nearly went off the road...
I copied mine from Shawn White on here....two of the posts like Chris Atkinson has pictured with a grass seed sack zip tied to them. They are nicely collapsable and the grass seed sacks are durable. If you can get seed sacks get the 40 pound size....they are nice and big.
I used to use the tyvek painter outfits on a stick. Then we needed a stickman for a retired gunner to take out to help it be seen in a trial. I offered one of mine and someone offered one of theirs. Theirs was significantly more visible than mine. It is the one made by Lou Magee: http://www.mageeproducts.com/products.html
I have since switched. These things are great, take up much less room in the breezeway than the old ones and Lou is a pleasure to deal with.