He bore no tattoos on his arms or any other part of his body. He wore long-sleeved shirts to maintain an air of formality. AnswerParty!
A sleeve tattoo (or tattoo sleeve) is a large tattoo, or a collection of smaller tattoos, usually themed in similar manner, that covers most or all of a person's arm, usually from shoulder to wrist.
The term "sleeve" is a reference to the tattoo's size similarity in coverage to a long shirt sleeve on an article of clothing. In this manner, the term is also used as a verb; for example, "getting sleeved" means to have one's entire arm tattooed. The term is also sometimes used in reference to a large leg tattoo that covers a person's leg in a similar manner.