A slutty or particulary promiscuous ensemble
Person 1: Look at Jane. How slutty is her outfit!
person 2: I know! its a total slutfit!
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an outfit bought or worn so as to attract members of the opposite sex.
We're going to Vegas this weekend, so we all need to buy some slutfits!
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Slutty + outfit = slutfit
Used to imply typically an outfit when going out (though can be worn at any time) - that is often considered risquรฉ or revealing with a positive connotation.
I canโt wait to wear a slutfit tonight.