The Sopranos guys get dressed up sometimes, when
appropriate like Junior's installation as boss
and when New York people like Johnny Sacks are over for dinner.

But a lot of them are active guys (I mean in terms of direct enforcement not fitness) and jogging suits and polos are a lot more practical.

There's still a dress code in the mob. I know it's going back a little, but remember how in
Donnie Brasco - Lefty teaches Donnie how to dress.

I believe that the guys are expected to throw on at least a sports jacket and proper trousers in the evening.

After the excesses of Gotti - I imagine everyone's been told that a little restraint in the flash department is wise.