Good suits that look good are expensive. I don't want to wear daddy tier suits, but good looking suits I've seen run well over $500.
And this in an Amsterdam broadcasting and advertising company, the kind of place that makes the way people dress in tech start-ups look conservative.
After two weeks, people would stop making remarks. After a month, people stopped consciously registering it. It was just the way he dressed.
It takes balls and requires your coworkers not to be total dicks, but people can pull it off.
Buy vintage. You can get an $800 suit for $40 at Goodwill. Treasure hunting is fun. Seriously.
Make light of it. I call it "Fancy Friday" and sometimes refer to it as a "ridiculous affectation" or "grown-up cosplay". People get used to it and now comment when I'm not dressed up on Fridays.