Hi Bob,
I can't give you the pattern, but it's purchasable from Project Puppet's website. It's the forma series rotundo puppet pattern. Probably a little more rounded than the real Ernie but once the hair and features are on it's pretty close. It's one of the more expensive patterns as you need to purchase the additional fleece head covering pattern but it's absolutely worth it. Those patterns are what has taught me most (apart from research on this forum) about making the puppets I have made. All of my puppets to date have been from one of project puppets patterns, except my kermits head, hand/arms and feet/legs. All my other patterns were either exact or alterations of those patterns. The descriptions they give are also really helpful to get you through the build.
The body above was a slightly enlarged version of the rotundo standard body, but it's still not right. I'm going to finish the above Ernie, then order some white antron fleece, dye it the correct orange and remake him with a larger body and try to find the right way to do his shirt. I'd like to give it the proper stitched/knitted top look but I'm not really sure how to go about doing that. I don't think you can buy that sort of material, I think I may need to learn how to knit unfortunately.
If anyone has any helpful hints to Ernie's proper striped shirt I'd be eternally grateful. Until then, he'll be fashioned in a sleeping top from a really simple pattern with no buttons, just basically a pull-over fleece jumper type top.
Greg