There is a technology called hair coloring, stack it with a hoodie and some well fitted slacks, roll up one of the ankle cuffs a bit. Talk like you've exited a startup and are just working for fun, or something to keep you interested, but not like you actually have to.
Agree 100%, it has blown me away my whole life how engineers downplay marketing and [product|personal] presentation in spite of the reams of data suggesting it has some of the best ROI possible of anything you can spend your time improving. Do you want to make more money, get more connections, have everyone like you more and treat you better? It's as simple as buying some nicer shirts, getting regular haircuts, and e…
I'm not saying that one shouldn't adapt a bit, but dyed hair and "How do you do, fellow kids" clothes overshoot the goal by a good bit.