Okay, I've made this tutorial because, well, we have bad garb. Hosen are perfectly accurate garb for almost the entire middle ages, whereas pants only work for a few of the later years, in France. Yes, I'm being eurocentric.
Anyways. These are probably the easiest way to get veteran level garb in like, an hour, with a 7$ pair of pants.
1. Find a pair of suit pants that are definitely wool. They are typically 5-7$ at salvation army, good will etc. You'll want them as long as possible.
2. Cut off all the mundane pockets and zippers.
3. Separate the two legs at the seam.
4. Split the inside seam.
5. Pattern the flat wool you now have. I use this: http://historiclife.com/Essays/howto_hose.html
6. Cut it out. Sew. I like to hem the tops before I sew the sides. Makes it a touch easier.
On holding them up. I like to have a tablet woven belt that I tie them to. I even put eyelets in. A more period method would have been to sew a strip of cloth on the end. But the bobbin ran out, and I'm lazy.
One more thing I changed. These don't have feet the way I made them. I've seen evidence to support it, so I didn't put them in. Most folks do.
Okay, I guess images are disabled or not working. This threads also on the dag nats if you want pictures.