The thing is, if we're interviewing, and the person who shows up in Pajamas rocks out on the whiteboard, and just blows us away with their humility, ability to communicate, domain knowledge, and mental agility - I don't think we'd hold the Pajamas against them. Also - Pajamas are kind of a hipster startup wear on occasion. I recall our VP of HR showing up in pajamas at Loudcloud. And, I saw people wearing Pajamas at Lily's Crepery in San Mateo this weekend. Maybe they would lose marks on the Gym Short/undershirt thing - but they wouldn't automatically flunk out the interview.