Well, we never called them"jerseys" - just "letters". That usually meant the stitched kind - one material/pattern on top of another swen onto a t-shirt or sweatshirt.
My very first was given to me by my owl pal on Bid Night. It was a black sweatshirt with big letters in a black with white/red/yellow plaid. They were stitched on w/yellow thread. Truthfully, it was ugly, but I didn't think so then. I wore it all the time! I found out later that some girl's mom had bought it for her as an initiation gift, and she hated it, so she gave it to her first Owl Pal and it went on through the years! That part is kind of fun!
My first after-inititation letters were given to my by my boyfriend. It was a long sleeve red t-shirt with small letters in red on a yellow background. It was pretty, um, bright, but it was sweet of him and I still loved them.
The first ones I bought myself were this dusty rose/dusty blue/cream plaid on a dusty blue background swen onto a cream t-shirt. Hey, for the 90's it was a very hip color combo!
And my last ones were a navy/forest green plaid on navy background, big letters, on a heather grey sweatshirt. I loved that sweatshirt! I wore it all the time. I still have it in my closet and do wear it occasionally on weekends- only when my hair and makeup are done though!