What kind of 'coat' would I get for the suit + jeans look?

[TyroneFig]

I like the look where people wear jeans with a suit coat

what kind would i get, like just a suit seperate, a blazer, a sportcoat? what ARE the differences between them anyway?

I'd like one less than $100 someday.

Here are some examples, Seinfeld and Seth Mcfarlane

 

[Eason]

I like the look of wearing absolutely nothing except a pair of black socks.

 

[sl33p3rs]

looks fine to me i'd rock one too.

 

[TylerDurden]

Navy sport's coat?

Isn't that a 90's/80's look though?