Formal attire popularized Joe Kelly following his well-documented trip to the white house. Although traditionally coming from Mariachi bands, it is only worn in the most formal situations.
"I need to break out my Mariachi Jacket for the white house"
Someone who's brain is not functioning at full capacity.
Bless her heart, she walked straight into the PTA meeting wearing her bra on the outside of her Lane Bryant pantsuit, she's a maraca short of a Mariachi Band.