alt Hacker NewsI think most 'attractive' people put effort into their appearances, which might appeal to management types who evaluate work performance. Also, imo the best way to get a management position in my experience isn't to work hard, or be knowledgeable, but to be the least objectionable pick.
This varies with country/company, with Euros usually being appearance focused, but in US companies, it's dudes in crumpled T-shirts all the way to the top (in engineering).
Seriously, it's so entertaining to sit in on an important meeting with a US vendor which looks like a college dorm party with an impeccably dressed guy or lady (from sales and/or management) who sticks out like a sore thumb.
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That is far less common outside of tech. Even within tech, I did throw on a blazer and tie when I interviewed for my last job. Totally unnecessary but any company for which that’s actually a problem it’s a red flag. I did start dressing down a bit for most of the developer-oriented conferences I attend for the reason you say.
Best way to get a manager position is to be a few inches taller than everybody else. It doesn't make a lick of sense, but pay attention to how often the boss is taller than everybody else on the team. Not always, but far more often than random chance can account for.
(Incidentally, the best boss I ever had was barely 5 feet.)