I'm just about to embark on my first MCN out of some fleece I have lying about so it doesn't really matter if I stuff it up. But one thing has been bugging me about the leg elastic.

Just wondering, how stretched should the elastic be as you sew it? Should it just be a really hard stretch or just a bit. There are no instructions in my weeweka pattern to let me know. In your experience, FJ and Schaz - roughly how much shorter should the unstretched elastic be (at the end of the process), compared to the actual fabric you are sewing? 75%, 50%?