I made several 5ml freediving wetsuits a little over a year ago. If you go to the elios website, you will see they do sell neoprene and you can get something from them that will meet your needs. As far as a pattern, I lifted one from an existing Wetsuit I have, using a piece of heavier clear plastic and a sharpie pen. Then I just drew the patten on the neopren with the sharpie. When I cut the neoprene I found that an exacto knife work best, it's similar to a scape blade that a surgeon uses because you want a clean edge, using a scissors isn't a good idea because the edges are way too jagged and may not be the easiest to glue up.
I only used neoprene that was open cell on the inside and smooth on the outside because I just wanted to glue it and didn't want to do any sewing. I've had some experience in gluing up wetsuit tears that held up quite well. The wetsuit glue is something tht can be bought at any dive shop & you probably use a can or 2 of it for 1 wetsuit.
Also, as far the edges go; around the bottom of the jacket, top of the pants, ect, I used some thin strips of neoprene (1ml or thinner) and glued them to these edges to keep them from tearing. Also the frogs for the beaver tail, I got them from Elios also.
One thing I did discover, it took a lot longer to make my wetsuits than I thought, but they also turned out a lot better than I tought too and so far they've helded up quite well. If you want to make a wetsuit because you look at it as a challenge and an interesting project, go for it as it's kind of an art to do, but if you are doing it to save money, I would say, just get a part time job for a week or two and order a custom made suit from elios, either way, let me know how it turns out.
Later,
Brian