Where I work, my group has instituted "Fancy Fridays" where people wear bow ties, suits, button down shirts, etc. It's not mandatory (participation is maybe 20%), and no one from other teams really notices or cares. One of our RF engineers and one of our PMs likes designer clothes, but most don't. One software engineer dresses like a pirate (seriously). Tie-dye is somewhat popular. And of course, T-shirts and hoodies are common.
I've also interviewed many people wearing a wide variety of clothing, and no one cares about that either. If we judged interviews based on what people wore, drove, ate, etc. we'd never get any competent engineers. A good culture fit means they interested in technology and our product, not that they fit some (in my experience false) stereotype.
As for your test, if there is a big change in how you dress (in any way) after people know you, it will garner notice.
I've also interviewed many people wearing a wide variety of clothing, and no one cares about that either. If we judged interviews based on what people wore, drove, ate, etc. we'd never get any competent engineers. A good culture fit means they interested in technology and our product, not that they fit some (in my experience false) stereotype.
As for your test, if there is a big change in how you dress (in any way) after people know you, it will garner notice.