An eshirt is a purely digital version of a shirt, much as email is the digital version of mail. The eshirt is very versatile, also blurring into the realm of edresses or ecoats, as the designer simply outlines and fills in any desired shape on the subject of the photo.
Eshirts were invented by the LAMEWAVVE art collective as an online art form as well as a means of guerrilla marketing on Facebook, 'tagging' friends in signature yellow LAMEWAVVE eshirts.
-Hey did you get an eshirt?
-No, they're like invite only or something. But I 'liked' yours on Facebook, so maybe I'll get one now too.