Most of my cloth diapers are 2 years old now and just as everyone on the interweb claimed would happen, my elastic needs replacing. I bought a bunch of elastic from Joann's (it wasn't expensive at all, I think $6 worth finished up 11 diapers).
I used three pieces of elastic for each diaper (a piece for each leg and a piece across the back). All three pieces measured 5 1/4" but if I was to do it again, I'd do more like 4 3/4". This is still allowing for room to make your seam and cut off the excess.
I cut into the fleece at each end of where the old elastic was. Fleece doesn't fray, so I never even bothered to sew it back together. I did this a few weeks ago, the diapers have been through the wash quite a few times now, and they work exactly the same as they did before, but better because the elastic is tighter, of course. So don't be afraid to cut that fleece!
