It's a cultural fit, most SV companies don't do suits, it's just not part of the culture. So if you go and interview with a company, and no one's wearing suits,

It's a cultural fit, most SV companies don't do suits, it's just not part of the culture. So if you go and interview with a company, and no one's wearing suits, it makes it look like you're not going to fit in if you are wearing one. It's almost seen as over compensating for lack of technical skills or knowledge by wearing a suit, at least that was my impression.