He is also seen smoking a cigar a lot.
Mafia Sans wears an all black suit along with black shoes, black gloves, a red tie, and a black fedora. Most of the time he is depicted smoking a cigar.
Mafiatale Sans is known to be highly dangerous when fighting, however he is usually lazy and carefree, despite his demeanor. He is apart of the "Skelefamily", a Mafia family, that Frisk was put under care too, then Frisk became his, Papyrus and Gaster's "Boss". Originally before Frisk came along, Gaster was the boss of the family, he then thought it was too tiring and asked Sans to take his place, to which Sans denied this place. When Papyrus was asked to be boss of the family he happily obliged to it, then when Frisk was given to the family to be put under protection, Papyrus was overjoyed enough to give Frisk the role of the boss.
Mafia! Sans weapon is usually a tommy gun or a pistol. Papyrus uses a sniper rifle, he's a sniper man he's going to use one I'm pretty sure, and Gaster's weapon is unknown though it is thought that he does indeed use some kind of weapon when fighting.