The reason why he has that clothing is becuase during development in vacation I was wearing the exact clothes.

The reason why I was wearing these clothes was because there were lots of mosquitoes and it was an annoyance to me that they just suck my legs so I had the great idea to... wear jeans, and to about the same with my feet instead of sandals I had to wear my shoes, didn't need to wear a shirt with long sleeves as somehow the mosquitoes didn't sucked my arms...

And yeah the point of The Creator was that he was like a sort of representation of my "good site", while the other guy who just ruined Waldy's and other shit was the representation of... well you got the point but hey THAT'S PART OF THE LORE!