Probability Of Getting You Laid: 81%

It might be a cliché, but if you're a guy who doesn't normally wear a suit, throwing on one that is perfectly tailored will affect the way you present yourself, which will in turn affect the way people treat and receive you. Of course, simply putting on any garment isn't going to make girls throw themselves at you, but anything that boosts your confidence is going to up the probability of another human being going against all rational thought and spending the night with a stranger.