I really hate sewing sleeves and collars. They need patterns, and getting curved pieces to match up smoothly is a major pain.
So I was more than a little intimidated by the idea of this shrug, which is pretty much nothing but sleeves and a collar.
Then it occurred to me what I wanted was essentially a shirt with most of the body removed, and that's exactly how I should create one.
I started with a Goodwill shirt made out of "polyester with polyethylene coating." This thing has never come within a mile of a natural fiber. The upside of that is it can't fray. But that's not very steampunk, is it? By material, not really, but by look, sure. In small quantities, it gives a leather-like impression. (As a shirt, it billowed far too much to appear leathery.)
As an Aside: Consider that someone had to design this and then some port of approval process agreed that this was a good idea.. Then, a minimum of one buyer agreed with this conclusion, although I wouldn't hazard a guess as to which decade this would have occurred. There is no reason for any sane person to have worn that shirt...ever.
I'd like to think of my costume collection as a closet for wayward and abused articles of clothing. They're given a good home and find new purpose in existence.
Step one: Go to a thrift store and get an appropriate shirt. Appropriate depends entirely on what kind of look you're wanting. If you're thinking leather, check out the coats. You can often get a leather coat at Goodwill for $10-$20 bucks. Do keep in mind that working with leather can be more difficult. You might not be able to hem it (although leather doesn't unravel, so it's not strictly necessary).
Step two: Cut off the excess material. You may want to start by leaving an overly generous amount of material, trying it on, and then trimming to suit. You can never try something on too often. Also, remember to leave enough material to hem, if you're going to hem.
Be careful not to compromise the sleeves. I started about 2 inches below the bottom of where the sleeve joins the torso and cut straight across, then diagonally cut out the front.
Step three: Accessorize and modify
to taste. Some suggestions: