Dressing uniquely in golf is not something that started in the last 10-20 years.
A gentleman named Doug Sanders, who won 20 times on the PGA Tour from 1956-1972, is generally regarded as the one who started breaking whatever the fashion rules were of the day.
Pink, lime green, you name it. Sanders wore it and made a name for himself in the process.
Here's a list of the 10 worst dressers on the PGA tour. And, to be clear, these guys are wearing cut-rate clothes when you watch them on TV. The hats, shirts, slack, shoes they wear are out of reach financially for most of the people watching them.
But that doesn't mean they put all those together nicely!