"i am perhaps the most well known typeface in history. i now live on a brown shirt."
4321 -- True short sleeves, with binding at neck but not at the sleeves. It's a Baby Rib Basic intended for ladies.
2001 -- This is the t-shirt that defines the word. One of the softest and smoothest T-shirts ever made with the finest jersey cotton. Intended for everyone.
Both styles are white print on a brown shirt.