Well I'd like to have a jersey that has the 3 pockets in the back. And the material doesn't really make that much of a difference as long as it gets the sweat out from my skin and it has the pockets. I don't care if I have to go to KMart. As long as it meets that criteria.
L.L. Bean has long and short sleeve jerseys that go up to 2x, but they're pretty big. A few months ago I got an XL long sleeve jersey from the and it was too big... but I usually wear a 2x t-shirt. All their jerseys have the back pockets.
The great thing about dealing with L.L. Bean is that you can return anything that doesn't fit and they'll take care of it right away.