Ours are a little different--they're made from some kind of thick cotton material and I think they're also scotchgarded like crazy (when they're new, they feel kind of plasticky). All the chapters here put names or nicknames across the top of the back, but ADPi includes a number on theirs (family number? member number? calling ZXAlum, I don't remember!). Nothing on the sleeve, though, but most have a band of stripey stuff between the main part and the sleeve.
Here's a bunch of us at Fall Parties (the first recruitment event here):
And here's the mini-jersey I made my "roommate" for Halloween (I had planned to go as a big purple bunny, ha ha):