Last Fall, I made a baby sweater based on the icon that Alec drew for the Undone the Sweater song on the Weezer memories tour poster. Now it fits our daughter Suzanne and yes, she is named after the Weezer song.
I used this free pattern: Lion Jumper by Phildar
Since the =w= design is on the front I picked a pattern that opens in the back. But that was before I was a parent and learned that back closures on baby clothes are pretty dumb. Technically it could be reversible anyway, but she won't be wearing it too much longer anyway. If I made it again I would use a pattern that just has some buttons around the neckline.
The string is left intentionally because the song is about a sweater coming apart.