When I first made a pattern I used cloth to wrap around a person to figure it out since I didn't know where to get any pre-designed patterens. I drew a center line sort of to act like a crease on a pair of pants, then used a marker to draw the lines on where the zipper line would lie, the shape of the top and bottom. I then connected to dots so to speak and cut it out and put it back on the person. With a couple of minor adjustments it worked out fine and I used that to develop future ones. Since I make a lot of styles and sizes now I have many in small-medium-large, and so on. As far as getting a pattern I'd surf the internet. I haven't looked for any for a long time. Western Horseman magazine had and add for a while about patterns for chaps, vests, and other show clothes from a place in California. I'll try to see if I can find the name of the place since I same all the magazines. Depending on size of the person and the type of leather you decide to use that will determine if you cut the fringe in body or add it on. Split hides aren't usually large enough to cut the fringe in body with the leg and need to be added. Top grain sides will allow you to do it depending on the size of person you are making them for. Hide House has the top grain sides I use most often and they call it Cowside Leather. It's a 3-3 1/2 oz and comes in over 40 colors. They are normally very large and are very good quality. Sheridan Leather is another good source for some great leather depending on your location. One large side will do both legs normally on a youth,small, or most medium sized patterns depending on the style and height. Hope this helps some and ask all the questions you can think of. I'll help all I can. I'm new on here and still trying to figure out how to do and find things on here, a computer wiz I'm certainly not. I did post some pictures you can look at in the gallery of some chaps. There might be a better place to put them but I haven't figured that out yet. It only took me 2 weeks to get signing up on here right!